Port Isabel Weather Records (USC00417179)

Record envelope, standing records and threshold days for Port Isabel (USC00417179), Texas, United States, with 131 years of record.

Key Facts for Port Isabel

Port Isabel (USC00417179) is a weather station in Texas, United States at 26.09 latitude and -97.31 longitude, 4 m (12 ft) above sea level.
The station reports from 1896 to 2026, 131 years of record.
1,464 records set at Port Isabel still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Port Isabel set a daily record low minimum temperature of 10.6 C (51.1 F) on 11 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

Location: Texas, United States, 26.09 latitude, -97.31 longitude.
Elevation: 4 m (12 ft).
Period of record: 1896 to 2026, 131 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

22 days at or beyond a record

The band shows the record high and record low for each calendar day at Port Isabel. The lines show the 2026 daily maximum and minimum. 22 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Port Isabel, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	31.7 C (89.1 F)	-5.6 C (21.9 F)	28.9 C (84.0 F)	-1.7 C (28.9 F)
Feb	32.8 C (91.0 F)	-5.0 C (23.0 F)	30.6 C (87.1 F)	5.0 C (41.0 F)
Mar	37.8 C (100.0 F)	-0.6 C (30.9 F)	31.7 C (89.1 F)	10.6 C (51.1 F)
Apr	36.7 C (98.1 F)	2.8 C (37.0 F)	30.0 C (86.0 F)	13.3 C (55.9 F)
May	36.7 C (98.1 F)	11.1 C (52.0 F)	32.2 C (90.0 F)	15.6 C (60.1 F)
Jun	38.3 C (100.9 F)	16.7 C (62.1 F)	33.9 C (93.0 F)	23.9 C (75.0 F)
Jul	37.2 C (99.0 F)	18.9 C (66.0 F)	36.7 C (98.1 F)	24.4 C (75.9 F)
Aug	38.3 C (100.9 F)	19.4 C (66.9 F)	36.7 C (98.1 F)	24.4 C (75.9 F)
Sep	39.4 C (102.9 F)	12.8 C (55.0 F)	36.1 C (97.0 F)	25.0 C (77.0 F)
Oct	35.6 C (96.1 F)	2.8 C (37.0 F)	35.0 C (95.0 F)	10.6 C (51.1 F)
Nov	35.0 C (95.0 F)	-1.7 C (28.9 F)	n/a	n/a
Dec	32.2 C (90.0 F)	-8.3 C (17.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Port Isabel still stand. 1942 holds the most, with 62.

Standing records at Port Isabel by the year they were set
Year set	Standing records
1928	28
1929	30
1930	26
1931	17
1932	27
1933	22
1934	25
1935	21
1936	34
1937	16
1938	23
1939	23
1940	16
1941	11
1942	62
1943	3
1944	10
1945	19
1946	14
1947	20
1948	17
1949	8
1950	18
1951	13
1952	8
1953	12
1954	7
1955	12
1956	4
1957	12
1958	8
1959	14
1960	9
1961	7
1962	14
1963	10
1964	11
1965	14
1966	13
1967	14
1968	11
1969	7
1975	12
1976	17
1977	8
1978	4
1979	13
1980	10
1981	6
1982	7
1983	4
1984	16
1985	15
1986	12
1987	15
1988	16
1989	39
1990	14
1991	21
1992	7
1993	15
1994	14
1995	12
1996	11
1997	17
1998	20
1999	15
2000	25
2001	11
2002	9
2003	15
2004	17
2005	24
2006	20
2007	19
2008	27
2009	33
2010	13
2011	31
2012	12
2013	19
2014	13
2020	20
2021	11
2022	16
2023	30
2024	24
2025	25
2026	20

All-Time Record Progression

11 new records

11 all-time records were set at Port Isabel between 23 April 1956 and 25 December 2004. Each dot is a new record.

When Port Isabel set new all-time records
Date	Kind	Detail
1956-04-23	Record daily precipitation	Record daily precipitation 189.2 mm (7.4 in)
1962-01-11	Record low maximum temperature	Record low maximum temperature -1.7 C (28.9 F)
1962-01-12	Record low minimum temperature	Record low minimum temperature -5.6 C (21.9 F)
1975-09-01	Record daily precipitation	Record daily precipitation 277.1 mm (10.9 in)
1984-09-19	Record daily precipitation	Record daily precipitation 304.8 mm (12.0 in)
1985-06-14	Record high maximum temperature	Record high maximum temperature 38.3 C (100.9 F)
1989-12-23	Record low maximum temperature	Record low maximum temperature -2.2 C (28.0 F)
1989-12-23	Record low minimum temperature	Record low minimum temperature -8.3 C (17.1 F)
2002-09-08	Record high maximum temperature	Record high maximum temperature 39.4 C (102.9 F)
2004-12-25	Record daily snowfall	Record daily snowfall 7.6 cm (3.0 in)
2004-12-25	Record snow depth	Record snow depth 7.6 cm (3.0 in)

Wettest Day of Each Month

Sep: 304.8 mm (12.0 in)

The wettest day on record for each calendar month at Port Isabel. The most was 304.8 mm (12.0 in) on 19 September 1984.

Record daily precipitation for each month at Port Isabel
Month	Record daily precipitation (mm)	Date
Jan	94.0 mm (3.7 in)	16 January 1988
Feb	71.9 mm (2.8 in)	22 February 1958
Mar	215.9 mm (8.5 in)	28 March 2025
Apr	189.2 mm (7.4 in)	23 April 1956
May	128.0 mm (5.0 in)	29 May 1929
Jun	167.6 mm (6.6 in)	22 June 1941
Jul	130.8 mm (5.1 in)	31 July 1978
Aug	128.3 mm (5.1 in)	26 August 1945
Sep	304.8 mm (12.0 in)	19 September 1984
Oct	151.6 mm (6.0 in)	14 October 1932
Nov	198.1 mm (7.8 in)	1 November 2002
Dec	152.4 mm (6.0 in)	21 December 1940

Period of Record Coverage

1928 to 2026

89 years of record at Port Isabel, 1928 to 2026. 18 years have data for under 90 percent of days and are left out of rankings: 1928, 1939, 1967, 1968, 1969, 1975, 1976, 1982 and others.

Days with data per year at Port Isabel
Year	Days with data	Share of year	Complete
1928	241	66%	No
1929	365	100%	Yes
1930	365	100%	Yes
1931	363	99%	Yes
1932	366	100%	Yes
1933	359	98%	Yes
1934	335	92%	Yes
1935	365	100%	Yes
1936	366	100%	Yes
1937	364	100%	Yes
1938	365	100%	Yes
1939	304	83%	No
1940	365	100%	Yes
1941	364	100%	Yes
1942	359	98%	Yes
1943	361	99%	Yes
1944	361	99%	Yes
1945	363	99%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	362	99%	Yes
1949	364	100%	Yes
1950	365	100%	Yes
1951	362	99%	Yes
1952	364	99%	Yes
1953	358	98%	Yes
1954	364	100%	Yes
1955	365	100%	Yes
1956	365	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	333	91%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	364	100%	Yes
1964	365	100%	Yes
1965	357	98%	Yes
1966	359	98%	Yes
1967	327	90%	No
1968	307	84%	No
1969	273	75%	No
1975	165	45%	No
1976	267	73%	No
1977	347	95%	Yes
1978	361	99%	Yes
1979	362	99%	Yes
1980	360	98%	Yes
1981	332	91%	Yes
1982	288	79%	No
1983	150	41%	No
1984	332	91%	Yes
1985	356	98%	Yes
1986	335	92%	Yes
1987	365	100%	Yes
1988	363	99%	Yes
1989	359	98%	Yes
1990	361	99%	Yes
1991	362	99%	Yes
1992	365	100%	Yes
1993	363	99%	Yes
1994	362	99%	Yes
1995	352	96%	Yes
1996	355	97%	Yes
1997	343	94%	Yes
1998	360	99%	Yes
1999	364	100%	Yes
2000	353	96%	Yes
2001	348	95%	Yes
2002	344	94%	Yes
2003	364	100%	Yes
2004	364	99%	Yes
2005	358	98%	Yes
2006	364	100%	Yes
2007	362	99%	Yes
2008	349	95%	Yes
2009	354	97%	Yes
2010	296	81%	No
2011	292	80%	No
2012	301	82%	No
2013	306	84%	No
2014	175	48%	No
2020	227	62%	No
2021	251	69%	No
2022	306	84%	No
2023	336	92%	Yes
2024	335	92%	Yes
2025	353	97%	Yes
2026	268	73%	No

Latest Records

Latest records at Port Isabel
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
11 October 2026	Port Isabel, US	daily low min (Provisional)	10.6 C (51.1 F)	0.5 C (0.9 F)	49 years	24 of 100 (Routine)
5 October 2026	Port Isabel, US	daily rain (Provisional)	103.4 mm (4.1 in)	61.5 mm (2.4 in)	57 years	58 of 100 (Notable)
1 October 2026	Port Isabel, US	daily high min (Provisional)	28.3 C (82.9 F)	1.1 C (2.0 F)	71 years	32 of 100 (Routine)
1 October 2026	Port Isabel, US	daily high max (Provisional)	35.0 C (95.0 F)	1.1 C (2.0 F)	45 years	25 of 100 (Routine)
26 September 2026	Port Isabel, US	daily high min (Tie, Provisional)	26.7 C (80.1 F)	tie	80 years	8 of 100 (Routine)
24 September 2026	Port Isabel, US	daily high min (Tie, Provisional)	27.8 C (82.0 F)	tie	96 years	9 of 100 (Routine)
13 September 2026	Port Isabel, US	daily high min (Provisional)	27.8 C (82.0 F)	0.6 C (1.1 F)	93 years	39 of 100 (Notable)
13 September 2026	Port Isabel, US	daily high max (Tie, Provisional)	35.0 C (95.0 F)	tie	16 years	3 of 100 (Routine)
11 September 2026	Port Isabel, US	daily high min (Tie, Provisional)	27.2 C (81.0 F)	tie	96 years	9 of 100 (Routine)
11 September 2026	Port Isabel, US	daily high max (Tie, Provisional)	36.1 C (97.0 F)	tie	88 years	8 of 100 (Routine)
10 September 2026	Port Isabel, US	daily high min (Tie, Provisional)	27.2 C (81.0 F)	tie	96 years	9 of 100 (Routine)
23 August 2026	Port Isabel, US	daily high max (Provisional)	36.7 C (98.1 F)	0.6 C (1.1 F)	16 years	16 of 100 (Routine)
22 August 2026	Port Isabel, US	daily high max (Tie, Provisional)	35.0 C (95.0 F)	tie	97 years	9 of 100 (Routine)
21 August 2026	Port Isabel, US	daily high max (Tie, Provisional)	35.6 C (96.1 F)	tie	16 years	3 of 100 (Routine)
21 August 2026	Port Isabel, US	daily high min (Tie, Provisional)	27.8 C (82.0 F)	tie	21 years	3 of 100 (Routine)
20 August 2026	Port Isabel, US	daily high min (Tie, Provisional)	27.8 C (82.0 F)	tie	28 years	4 of 100 (Routine)
14 August 2026	Port Isabel, US	daily high min (Tie)	27.8 C (82.0 F)	tie	97 years	9 of 100 (Routine)
29 July 2026	Port Isabel, US	daily high min (Tie)	27.2 C (81.0 F)	tie	60 years	6 of 100 (Routine)
24 July 2026	Port Isabel, US	daily rain	50.8 mm (2.0 in)	13.2 mm (0.5 in)	76 years	40 of 100 (Notable)
23 July 2026	Port Isabel, US	daily high max	36.7 C (98.1 F)	0.6 C (1.1 F)	3 years	13 of 100 (Routine)

Climate Trend

60 complete years, 1929 to 2025

One stripe for each of 60 complete years at Port Isabel, 1929 to 2025. Blue stripes are years cooler than the station's own mean of 23.4 C (74.1 F); red stripes are warmer. The coolest year was 1936, at 21.4 C (70.5 F), and the warmest was 1950, at 24.4 C (75.9 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at Port Isabel as warming stripes, 1929 to 2025
Year	Annual mean temperature	Difference from the station mean
1929	22.9 C	-0.50 C
1930	22.5 C	-0.94 C
1931	22.9 C	-0.50 C
1932	22.8 C	-0.63 C
1933	24.1 C	+0.73 C
1935	23.8 C	+0.40 C
1936	21.4 C	-1.99 C
1937	23.2 C	-0.23 C
1938	24.2 C	+0.76 C
1940	23.2 C	-0.21 C
1942	22.2 C	-1.18 C
1943	23.2 C	-0.18 C
1944	23.3 C	-0.11 C
1945	24.2 C	+0.84 C
1946	23.9 C	+0.48 C
1948	23.2 C	-0.21 C
1949	23.7 C	+0.30 C
1950	24.4 C	+1.02 C
1951	23.5 C	+0.08 C
1952	23.4 C	-0.02 C
1953	23.8 C	+0.36 C
1954	24.0 C	+0.65 C
1955	23.6 C	+0.24 C
1956	23.9 C	+0.49 C
1957	24.3 C	+0.94 C
1958	22.9 C	-0.48 C
1960	22.8 C	-0.61 C
1961	23.2 C	-0.15 C
1962	23.5 C	+0.06 C
1963	23.1 C	-0.27 C
1964	23.5 C	+0.07 C
1965	23.7 C	+0.30 C
1977	23.2 C	-0.22 C
1978	22.5 C	-0.92 C
1979	22.6 C	-0.81 C
1980	23.0 C	-0.43 C
1985	22.9 C	-0.49 C
1987	22.2 C	-1.19 C
1988	22.5 C	-0.92 C
1989	22.3 C	-1.07 C
1990	23.3 C	-0.13 C
1992	23.1 C	-0.25 C
1993	23.1 C	-0.28 C
1994	23.8 C	+0.44 C
1995	23.4 C	-0.01 C
1996	22.9 C	-0.49 C
1998	24.3 C	+0.90 C
1999	24.3 C	+0.94 C
2000	24.1 C	+0.75 C
2001	23.8 C	+0.45 C
2003	23.4 C	-0.03 C
2004	23.5 C	+0.12 C
2005	23.8 C	+0.43 C
2006	24.4 C	+0.99 C
2007	23.4 C	+0.02 C
2008	23.8 C	+0.41 C
2009	23.8 C	+0.42 C
2023	24.1 C	+0.71 C
2024	24.3 C	+0.87 C
2025	23.9 C	+0.52 C

The fitted trend in annual mean temperature here over 1929 to 2025 is 0.06 C (0.00 to 0.12) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.10 F (0.00 to 0.21) per decade. The slope is a straight line fitted to 60 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Port Isabel
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.06 C (0.00 to 0.12) per decade	0.10 F (0.00 to 0.21) per decade	1929 to 2025	60	Not clearly different from zero
Mean daily maximum	0.1 C (0.1 to 0.2) per decade	0.2 F (0.1 to 0.3) per decade	1929 to 2025	60	Rise
Mean daily minimum	-0.01 C (-0.07 to 0.05) per decade	-0.02 F (-0.13 to 0.09) per decade	1929 to 2025	60	Not clearly different from zero

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1896 to 2026

Yearly extremes at Port Isabel: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	39.4 C (102.9 F)	2002	35.6 C (96.1 F)	89
Coldest night (TNn)	-8.3 C (17.1 F)	1989	1.1 C (34.0 F)	89
Wettest day (Rx1day)	304.8 mm (12.0 in)	1984	82.3 mm (3.2 in)	93
Wettest five days (Rx5day)	532.1 mm (20.9 in)	1984	114.8 mm (4.5 in)	93
Longest dry spell (CDD)	118 days	1998	41 days	93

Hottest day (TXx)

The hottest day of the year at Port Isabel, 1896 to 2026. The record is 39.4 C (102.9 F) in 2002, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at Port Isabel by year
Year	Hottest day (TXx)
1896	n/a
1897	n/a
1898	n/a
1900	n/a
1928	37.8 C (100.0 F)
1929	33.9 C (93.0 F)
1930	33.9 C (93.0 F)
1931	33.3 C (91.9 F)
1932	34.4 C (93.9 F)
1933	34.4 C (93.9 F)
1934	36.7 C (98.1 F)
1935	37.2 C (99.0 F)
1936	37.2 C (99.0 F)
1937	36.7 C (98.1 F)
1938	36.7 C (98.1 F)
1939	35.0 C (95.0 F)
1940	36.7 C (98.1 F)
1941	36.1 C (97.0 F)
1942	33.9 C (93.0 F)
1943	33.9 C (93.0 F)
1944	35.6 C (96.1 F)
1945	35.6 C (96.1 F)
1946	35.0 C (95.0 F)
1947	36.1 C (97.0 F)
1948	35.6 C (96.1 F)
1949	34.4 C (93.9 F)
1950	34.4 C (93.9 F)
1951	34.4 C (93.9 F)
1952	33.9 C (93.0 F)
1953	34.4 C (93.9 F)
1954	37.2 C (99.0 F)
1955	34.4 C (93.9 F)
1956	34.4 C (93.9 F)
1957	35.6 C (96.1 F)
1958	35.6 C (96.1 F)
1959	36.7 C (98.1 F)
1960	35.6 C (96.1 F)
1961	37.2 C (99.0 F)
1962	36.1 C (97.0 F)
1963	34.4 C (93.9 F)
1964	35.0 C (95.0 F)
1965	35.6 C (96.1 F)
1966	36.7 C (98.1 F)
1967	33.9 C (93.0 F)
1968	34.4 C (93.9 F)
1969	36.7 C (98.1 F)
1975	34.4 C (93.9 F)
1976	34.4 C (93.9 F)
1977	36.7 C (98.1 F)
1978	35.6 C (96.1 F)
1979	36.1 C (97.0 F)
1980	35.6 C (96.1 F)
1981	35.6 C (96.1 F)
1982	35.0 C (95.0 F)
1983	33.3 C (91.9 F)
1984	37.8 C (100.0 F)
1985	38.3 C (100.9 F)
1986	33.9 C (93.0 F)
1987	33.3 C (91.9 F)
1988	35.6 C (96.1 F)
1989	36.7 C (98.1 F)
1990	34.4 C (93.9 F)
1991	34.4 C (93.9 F)
1992	34.4 C (93.9 F)
1993	34.4 C (93.9 F)
1994	35.6 C (96.1 F)
1995	35.6 C (96.1 F)
1996	37.8 C (100.0 F)
1997	33.9 C (93.0 F)
1998	35.6 C (96.1 F)
1999	35.6 C (96.1 F)
2000	37.8 C (100.0 F)
2001	35.0 C (95.0 F)
2002	39.4 C (102.9 F)
2003	37.2 C (99.0 F)
2004	36.1 C (97.0 F)
2005	37.8 C (100.0 F)
2006	36.7 C (98.1 F)
2007	35.6 C (96.1 F)
2008	36.7 C (98.1 F)
2009	37.2 C (99.0 F)
2010	36.7 C (98.1 F)
2011	36.1 C (97.0 F)
2012	38.3 C (100.9 F)
2013	37.8 C (100.0 F)
2014	36.7 C (98.1 F)
2020	36.7 C (98.1 F)
2021	35.0 C (95.0 F)
2022	35.6 C (96.1 F)
2023	37.2 C (99.0 F)
2024	37.2 C (99.0 F)
2025	35.6 C (96.1 F)
2026	36.7 C (98.1 F)

Coldest night (TNn)

The coldest night of the year at Port Isabel, 1896 to 2026. The record is -8.3 C (17.1 F) in 1989, marked on the chart; the median year is 1.1 C (34.0 F).

Coldest night (TNn) at Port Isabel by year
Year	Coldest night (TNn)
1896	n/a
1897	n/a
1898	n/a
1900	n/a
1928	5.0 C (41.0 F)
1929	0.0 C (32.0 F)
1930	-5.0 C (23.0 F)
1931	3.9 C (39.0 F)
1932	0.0 C (32.0 F)
1933	-1.1 C (30.0 F)
1934	3.3 C (37.9 F)
1935	-2.2 C (28.0 F)
1936	-0.6 C (30.9 F)
1937	1.7 C (35.1 F)
1938	2.8 C (37.0 F)
1939	3.9 C (39.0 F)
1940	-3.3 C (26.1 F)
1941	3.3 C (37.9 F)
1942	1.1 C (34.0 F)
1943	-1.1 C (30.0 F)
1944	0.0 C (32.0 F)
1945	3.3 C (37.9 F)
1946	0.6 C (33.1 F)
1947	-1.7 C (28.9 F)
1948	-2.2 C (28.0 F)
1949	-3.3 C (26.1 F)
1950	1.1 C (34.0 F)
1951	-5.0 C (23.0 F)
1952	5.0 C (41.0 F)
1953	1.7 C (35.1 F)
1954	1.7 C (35.1 F)
1955	2.8 C (37.0 F)
1956	2.2 C (36.0 F)
1957	1.7 C (35.1 F)
1958	2.8 C (37.0 F)
1959	0.6 C (33.1 F)
1960	0.0 C (32.0 F)
1961	2.2 C (36.0 F)
1962	-5.6 C (21.9 F)
1963	-5.6 C (21.9 F)
1964	1.1 C (34.0 F)
1965	3.3 C (37.9 F)
1966	1.1 C (34.0 F)
1967	1.7 C (35.1 F)
1968	0.6 C (33.1 F)
1969	4.4 C (39.9 F)
1975	5.6 C (42.1 F)
1976	1.1 C (34.0 F)
1977	0.0 C (32.0 F)
1978	1.7 C (35.1 F)
1979	-1.7 C (28.9 F)
1980	1.1 C (34.0 F)
1981	1.7 C (35.1 F)
1982	4.4 C (39.9 F)
1983	4.4 C (39.9 F)
1984	5.0 C (41.0 F)
1985	-2.2 C (28.0 F)
1986	0.6 C (33.1 F)
1987	2.8 C (37.0 F)
1988	2.8 C (37.0 F)
1989	-8.3 C (17.1 F)
1990	-1.1 C (30.0 F)
1991	4.4 C (39.9 F)
1992	4.4 C (39.9 F)
1993	2.8 C (37.0 F)
1994	3.3 C (37.9 F)
1995	4.4 C (39.9 F)
1996	0.0 C (32.0 F)
1997	-1.7 C (28.9 F)
1998	1.7 C (35.1 F)
1999	3.9 C (39.0 F)
2000	1.7 C (35.1 F)
2001	1.1 C (34.0 F)
2002	-0.6 C (30.9 F)
2003	1.7 C (35.1 F)
2004	-2.2 C (28.0 F)
2005	2.2 C (36.0 F)
2006	1.1 C (34.0 F)
2007	1.7 C (35.1 F)
2008	2.2 C (36.0 F)
2009	-1.1 C (30.0 F)
2010	-0.6 C (30.9 F)
2011	-2.8 C (27.0 F)
2012	0.6 C (33.1 F)
2013	1.7 C (35.1 F)
2014	0.6 C (33.1 F)
2020	3.3 C (37.9 F)
2021	0.6 C (33.1 F)
2022	-3.3 C (26.1 F)
2023	3.3 C (37.9 F)
2024	-2.8 C (27.0 F)
2025	-1.1 C (30.0 F)
2026	-1.7 C (28.9 F)

Wettest day (Rx1day)

The wettest day of the year at Port Isabel, 1896 to 2026. The record is 304.8 mm (12.0 in) in 1984, marked on the chart; the median year is 82.3 mm (3.2 in).

Wettest day (Rx1day) at Port Isabel by year
Year	Wettest day (Rx1day)
1896	25.4 mm (1.0 in)
1897	38.1 mm (1.5 in)
1898	38.1 mm (1.5 in)
1900	25.4 mm (1.0 in)
1928	85.9 mm (3.4 in)
1929	128.0 mm (5.0 in)
1930	141.0 mm (5.6 in)
1931	68.3 mm (2.7 in)
1932	151.6 mm (6.0 in)
1933	53.3 mm (2.1 in)
1934	62.2 mm (2.4 in)
1935	85.6 mm (3.4 in)
1936	105.9 mm (4.2 in)
1937	57.4 mm (2.3 in)
1938	64.8 mm (2.6 in)
1939	83.8 mm (3.3 in)
1940	152.4 mm (6.0 in)
1941	167.6 mm (6.6 in)
1942	57.2 mm (2.3 in)
1943	125.7 mm (4.9 in)
1944	97.5 mm (3.8 in)
1945	128.3 mm (5.1 in)
1946	52.1 mm (2.1 in)
1947	95.3 mm (3.8 in)
1948	50.8 mm (2.0 in)
1949	121.2 mm (4.8 in)
1950	88.6 mm (3.5 in)
1951	89.7 mm (3.5 in)
1952	50.8 mm (2.0 in)
1953	47.8 mm (1.9 in)
1954	39.6 mm (1.6 in)
1955	51.1 mm (2.0 in)
1956	189.2 mm (7.4 in)
1957	103.6 mm (4.1 in)
1958	71.9 mm (2.8 in)
1959	54.9 mm (2.2 in)
1960	69.3 mm (2.7 in)
1961	123.4 mm (4.9 in)
1962	55.4 mm (2.2 in)
1963	47.5 mm (1.9 in)
1964	48.3 mm (1.9 in)
1965	107.2 mm (4.2 in)
1966	36.8 mm (1.4 in)
1967	154.9 mm (6.1 in)
1968	81.3 mm (3.2 in)
1969	45.5 mm (1.8 in)
1975	277.1 mm (10.9 in)
1976	124.5 mm (4.9 in)
1977	111.8 mm (4.4 in)
1978	152.4 mm (6.0 in)
1979	66.3 mm (2.6 in)
1980	52.3 mm (2.1 in)
1981	49.5 mm (1.9 in)
1982	87.6 mm (3.4 in)
1983	57.2 mm (2.3 in)
1984	304.8 mm (12.0 in)
1985	83.6 mm (3.3 in)
1986	81.3 mm (3.2 in)
1987	95.8 mm (3.8 in)
1988	94.0 mm (3.7 in)
1989	123.7 mm (4.9 in)
1990	64.0 mm (2.5 in)
1991	161.8 mm (6.4 in)
1992	82.3 mm (3.2 in)
1993	93.0 mm (3.7 in)
1994	66.8 mm (2.6 in)
1995	108.5 mm (4.3 in)
1996	81.8 mm (3.2 in)
1997	127.0 mm (5.0 in)
1998	92.5 mm (3.6 in)
1999	89.4 mm (3.5 in)
2000	94.5 mm (3.7 in)
2001	61.0 mm (2.4 in)
2002	198.1 mm (7.8 in)
2003	124.2 mm (4.9 in)
2004	78.7 mm (3.1 in)
2005	111.8 mm (4.4 in)
2006	63.5 mm (2.5 in)
2007	114.3 mm (4.5 in)
2008	76.2 mm (3.0 in)
2009	58.4 mm (2.3 in)
2010	118.4 mm (4.7 in)
2011	43.2 mm (1.7 in)
2012	86.4 mm (3.4 in)
2013	48.3 mm (1.9 in)
2014	35.6 mm (1.4 in)
2020	67.3 mm (2.6 in)
2021	55.9 mm (2.2 in)
2022	66.0 mm (2.6 in)
2023	55.9 mm (2.2 in)
2024	53.3 mm (2.1 in)
2025	215.9 mm (8.5 in)
2026	103.4 mm (4.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Port Isabel, 1896 to 2026. The record is 532.1 mm (20.9 in) in 1984, marked on the chart; the median year is 114.8 mm (4.5 in).

Wettest five days (Rx5day) at Port Isabel by year
Year	Wettest five days (Rx5day)
1896	19.1 mm (0.8 in)
1897	44.5 mm (1.8 in)
1898	72.4 mm (2.9 in)
1900	31.8 mm (1.3 in)
1928	112.3 mm (4.4 in)
1929	143.8 mm (5.7 in)
1930	159.5 mm (6.3 in)
1931	120.9 mm (4.8 in)
1932	255.0 mm (10.0 in)
1933	88.9 mm (3.5 in)
1934	78.6 mm (3.1 in)
1935	194.7 mm (7.7 in)
1936	139.0 mm (5.5 in)
1937	97.8 mm (3.9 in)
1938	64.8 mm (2.6 in)
1939	96.3 mm (3.8 in)
1940	173.0 mm (6.8 in)
1941	302.4 mm (11.9 in)
1942	107.9 mm (4.2 in)
1943	132.8 mm (5.2 in)
1944	116.1 mm (4.6 in)
1945	167.7 mm (6.6 in)
1946	104.7 mm (4.1 in)
1947	172.6 mm (6.8 in)
1948	119.1 mm (4.7 in)
1949	281.5 mm (11.1 in)
1950	91.1 mm (3.6 in)
1951	121.5 mm (4.8 in)
1952	106.1 mm (4.2 in)
1953	94.6 mm (3.7 in)
1954	94.0 mm (3.7 in)
1955	103.0 mm (4.1 in)
1956	203.5 mm (8.0 in)
1957	134.8 mm (5.3 in)
1958	150.2 mm (5.9 in)
1959	100.1 mm (3.9 in)
1960	93.3 mm (3.7 in)
1961	234.4 mm (9.2 in)
1962	74.9 mm (2.9 in)
1963	79.5 mm (3.1 in)
1964	70.9 mm (2.8 in)
1965	176.5 mm (6.9 in)
1966	71.7 mm (2.8 in)
1967	167.6 mm (6.6 in)
1968	101.6 mm (4.0 in)
1969	83.4 mm (3.3 in)
1975	303.0 mm (11.9 in)
1976	169.2 mm (6.7 in)
1977	144.6 mm (5.7 in)
1978	245.1 mm (9.6 in)
1979	114.8 mm (4.5 in)
1980	69.0 mm (2.7 in)
1981	117.1 mm (4.6 in)
1982	90.4 mm (3.6 in)
1983	61.8 mm (2.4 in)
1984	532.1 mm (20.9 in)
1985	106.5 mm (4.2 in)
1986	122.2 mm (4.8 in)
1987	169.0 mm (6.7 in)
1988	96.0 mm (3.8 in)
1989	148.9 mm (5.9 in)
1990	69.1 mm (2.7 in)
1991	170.2 mm (6.7 in)
1992	111.8 mm (4.4 in)
1993	149.4 mm (5.9 in)
1994	67.8 mm (2.7 in)
1995	144.8 mm (5.7 in)
1996	187.3 mm (7.4 in)
1997	236.8 mm (9.3 in)
1998	157.5 mm (6.2 in)
1999	95.3 mm (3.8 in)
2000	101.4 mm (4.0 in)
2001	101.6 mm (4.0 in)
2002	321.5 mm (12.7 in)
2003	305.0 mm (12.0 in)
2004	98.2 mm (3.9 in)
2005	216.0 mm (8.5 in)
2006	113.0 mm (4.4 in)
2007	114.3 mm (4.5 in)
2008	149.4 mm (5.9 in)
2009	138.4 mm (5.4 in)
2010	212.9 mm (8.4 in)
2011	55.9 mm (2.2 in)
2012	86.4 mm (3.4 in)
2013	97.8 mm (3.9 in)
2014	90.2 mm (3.6 in)
2020	74.7 mm (2.9 in)
2021	138.4 mm (5.4 in)
2022	74.2 mm (2.9 in)
2023	118.8 mm (4.7 in)
2024	82.3 mm (3.2 in)
2025	284.0 mm (11.2 in)
2026	268.7 mm (10.6 in)

Longest dry spell (CDD)

The longest dry spell of the year at Port Isabel, 1896 to 2026. The record is 118 days in 1998, marked on the chart; the median year is 41 days.

Longest dry spell (CDD) at Port Isabel by year
Year	Longest dry spell (CDD)
1896	61 days
1897	61 days
1898	65 days
1900	42 days
1928	74 days
1929	34 days
1930	47 days
1931	25 days
1932	36 days
1933	37 days
1934	28 days
1935	45 days
1936	20 days
1937	36 days
1938	30 days
1939	37 days
1940	41 days
1941	41 days
1942	29 days
1943	92 days
1944	47 days
1945	47 days
1946	39 days
1947	44 days
1948	40 days
1949	24 days
1950	81 days
1951	37 days
1952	37 days
1953	44 days
1954	48 days
1955	88 days
1956	52 days
1957	67 days
1958	50 days
1959	50 days
1960	33 days
1961	35 days
1962	52 days
1963	55 days
1964	46 days
1965	41 days
1966	67 days
1967	50 days
1968	23 days
1969	34 days
1975	33 days
1976	21 days
1977	47 days
1978	51 days
1979	29 days
1980	65 days
1981	36 days
1982	52 days
1983	41 days
1984	56 days
1985	33 days
1986	50 days
1987	29 days
1988	42 days
1989	63 days
1990	54 days
1991	59 days
1992	36 days
1993	32 days
1994	38 days
1995	52 days
1996	44 days
1997	40 days
1998	118 days
1999	47 days
2000	58 days
2001	44 days
2002	41 days
2003	34 days
2004	27 days
2005	40 days
2006	43 days
2007	29 days
2008	31 days
2009	76 days
2010	60 days
2011	31 days
2012	23 days
2013	17 days
2014	9 days
2020	20 days
2021	14 days
2022	20 days
2023	22 days
2024	31 days
2025	32 days
2026	69 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

70 years, 1898 to 2025

A day with at least 83.8 mm (3.3 in) of rain is expected about once in 2 years. A day with at least 259.0 mm (10.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Port Isabel: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	83.8 mm (3.3 in)
5 years	124.0 mm (4.9 in)
10 years	153.1 mm (6.0 in)
25 years	193.0 mm (7.6 in)
50 years	225.0 mm (8.9 in)
100 years	259.0 mm (10.2 in)	Longer than the 70 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 70 years of values from 1898 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 304.8 mm (12.0 in) in 1984; 215.9 mm (8.5 in) in 2025; 189.2 mm (7.4 in) in 1956.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

Data for Port Isabel standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Port Isabel threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-14. Last revised 14 October 2026 (2026-10-14).