Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Ko Samui. The lines show the 2026 daily maximum and minimum. 35 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Ko Samui, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
36.5 C (97.7 F)
18.6 C (65.5 F)
31.2 C (88.2 F)
20.7 C (69.3 F)
Feb
38.9 C (102.0 F)
17.8 C (64.0 F)
29.9 C (85.8 F)
21.6 C (70.9 F)
Mar
39.9 C (103.8 F)
20.4 C (68.7 F)
36.0 C (96.8 F)
23.5 C (74.3 F)
Apr
38.0 C (100.4 F)
21.7 C (71.1 F)
35.7 C (96.3 F)
22.9 C (73.2 F)
May
37.2 C (99.0 F)
21.3 C (70.3 F)
35.8 C (96.4 F)
24.9 C (76.8 F)
Jun
38.0 C (100.4 F)
20.6 C (69.1 F)
37.9 C (100.2 F)
22.8 C (73.0 F)
Jul
38.0 C (100.4 F)
19.9 C (67.8 F)
37.3 C (99.1 F)
24.9 C (76.8 F)
Aug
37.2 C (99.0 F)
18.8 C (65.8 F)
36.5 C (97.7 F)
24.4 C (75.9 F)
Sep
39.5 C (103.1 F)
19.4 C (66.9 F)
n/a
n/a
Oct
38.9 C (102.0 F)
20.5 C (68.9 F)
n/a
n/a
Nov
39.5 C (103.1 F)
19.6 C (67.3 F)
n/a
n/a
Dec
38.5 C (101.3 F)
18.8 C (65.8 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Ko Samui still stand. 2016 holds the most, with 102.
Standing records at Ko Samui by the year they were set
Year set
Standing records
1969
17
1970
33
1971
47
1972
25
1973
30
1974
46
1975
44
1976
63
1977
22
1978
18
1979
11
1980
9
1982
12
1983
14
1984
11
1985
11
1986
11
1987
46
1988
19
1989
9
1990
29
1991
19
1992
18
1993
16
1994
9
1995
15
1996
18
1997
16
1998
50
1999
19
2000
19
2001
14
2002
14
2003
16
2004
13
2005
14
2006
23
2007
27
2008
12
2009
21
2010
18
2011
17
2012
21
2013
19
2014
30
2015
86
2016
102
2017
21
2018
14
2019
39
2020
25
2021
36
2022
16
2023
34
2024
69
2025
37
All-Time Record Progression
1 new records
1 all-time records were set at Ko Samui between 3 February 2014 and 3 February 2014. Each dot is a new record.
When Ko Samui set new all-time records
Date
Kind
Detail
2014-02-03
Record low minimum temperature
Record low minimum temperature 17.8 C (64.0 F)
Wettest Day of Each Month
Nov: 464.1 mm (18.3 in)
The wettest day on record for each calendar month at Ko Samui. The most was 464.1 mm (18.3 in) on 24 November 1988.
Record daily precipitation for each month at Ko Samui
Month
Record daily precipitation (mm)
Date
Jan
389.9 mm (15.4 in)
8 January 1975
Feb
191.0 mm (7.5 in)
1 February 1987
Mar
307.3 mm (12.1 in)
28 March 2011
Apr
113.8 mm (4.5 in)
5 April 2022
May
126.2 mm (5.0 in)
4 May 2022
Jun
87.9 mm (3.5 in)
9 June 1996
Jul
119.1 mm (4.7 in)
4 July 1998
Aug
101.6 mm (4.0 in)
20 August 2020
Sep
116.1 mm (4.6 in)
22 September 1983
Oct
210.1 mm (8.3 in)
22 October 1998
Nov
464.1 mm (18.3 in)
24 November 1988
Dec
207.8 mm (8.2 in)
14 December 2024
Period of Record Coverage
1969 to 2025
Complete yearUnder 90 percent of days
57 years of record at Ko Samui, 1969 to 2025. 15 years have data for under 90 percent of days and are left out of rankings: 1981, 1982, 1983, 1985, 1987, 1988, 2005, 2014 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 23 complete years at Ko Samui, 1984 to 2021. Blue stripes are years cooler than the station's own mean of 28.0 C (82.4 F); red stripes are warmer. The coolest year was 1996, at 27.5 C (81.5 F), and the warmest was 1987, at 28.6 C (83.5 F). The strongest colour marks a difference of 0.7 C (1.3 F).
Annual mean temperature at Ko Samui as warming stripes, 1984 to 2021
Year
Annual mean temperature
Difference from the station mean
1984
27.9 C
-0.05 C
1987
28.6 C
+0.64 C
1992
27.7 C
-0.27 C
1993
27.7 C
-0.30 C
1994
27.6 C
-0.41 C
1996
27.5 C
-0.49 C
1997
27.9 C
-0.11 C
1998
28.3 C
+0.34 C
1999
27.6 C
-0.40 C
2001
27.8 C
-0.21 C
2002
28.2 C
+0.25 C
2003
28.0 C
-0.03 C
2004
27.9 C
-0.14 C
2007
27.8 C
-0.20 C
2008
27.9 C
-0.10 C
2009
28.2 C
+0.17 C
2010
28.3 C
+0.31 C
2011
27.9 C
-0.05 C
2012
28.4 C
+0.39 C
2016
27.9 C
-0.11 C
2017
28.1 C
+0.09 C
2020
28.4 C
+0.38 C
2021
28.4 C
+0.39 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1969 to 2025
Yearly extremes at Ko Samui: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.9 C (103.8 F)
1996
35.8 C (96.4 F)
57
Coldest night (TNn)
17.8 C (64.0 F)
2014
20.8 C (69.4 F)
45
Wettest day (Rx1day)
464.1 mm (18.3 in)
1988
129.0 mm (5.1 in)
53
Wettest five days (Rx5day)
1,038.1 mm (40.9 in)
1975
221.9 mm (8.7 in)
53
Longest dry spell (CDD)
55 days
1990
7 days
53
Hottest day (TXx)
The hottest day of the year at Ko Samui, 1969 to 2025. The record is 39.9 C (103.8 F) in 1996, marked on the chart; the median year is 35.8 C (96.4 F).
Hottest day (TXx) at Ko Samui by year
Year
Hottest day (TXx)
1969
29.5 C (85.1 F)
1970
28.8 C (83.8 F)
1971
28.5 C (83.3 F)
1972
28.4 C (83.1 F)
1973
29.2 C (84.6 F)
1974
28.4 C (83.1 F)
1975
28.2 C (82.8 F)
1976
27.4 C (81.3 F)
1977
28.5 C (83.3 F)
1978
29.3 C (84.7 F)
1979
29.6 C (85.3 F)
1980
29.1 C (84.4 F)
1981
30.0 C (86.0 F)
1982
38.0 C (100.4 F)
1983
37.7 C (99.9 F)
1984
35.2 C (95.4 F)
1985
34.9 C (94.8 F)
1986
39.1 C (102.4 F)
1987
37.9 C (100.2 F)
1988
36.0 C (96.8 F)
1989
35.6 C (96.1 F)
1990
39.5 C (103.1 F)
1991
35.2 C (95.4 F)
1992
36.5 C (97.7 F)
1993
34.8 C (94.6 F)
1994
35.3 C (95.5 F)
1995
38.9 C (102.0 F)
1996
39.9 C (103.8 F)
1997
37.0 C (98.6 F)
1998
36.0 C (96.8 F)
1999
35.0 C (95.0 F)
2000
34.5 C (94.1 F)
2001
35.0 C (95.0 F)
2002
39.5 C (103.1 F)
2003
36.0 C (96.8 F)
2004
35.8 C (96.4 F)
2005
35.4 C (95.7 F)
2006
36.5 C (97.7 F)
2007
35.3 C (95.5 F)
2008
34.8 C (94.6 F)
2009
35.8 C (96.4 F)
2010
36.3 C (97.3 F)
2011
35.3 C (95.5 F)
2012
36.7 C (98.1 F)
2013
36.2 C (97.2 F)
2014
36.8 C (98.2 F)
2015
36.6 C (97.9 F)
2016
38.0 C (100.4 F)
2017
35.9 C (96.6 F)
2018
35.5 C (95.9 F)
2019
38.0 C (100.4 F)
2020
36.5 C (97.7 F)
2021
36.8 C (98.2 F)
2022
36.3 C (97.3 F)
2023
37.7 C (99.9 F)
2024
37.3 C (99.1 F)
2025
37.9 C (100.2 F)
Coldest night (TNn)
The coldest night of the year at Ko Samui, 1969 to 2025. The record is 17.8 C (64.0 F) in 2014, marked on the chart; the median year is 20.8 C (69.4 F).
Coldest night (TNn) at Ko Samui by year
Year
Coldest night (TNn)
1969
n/a
1970
n/a
1971
n/a
1972
n/a
1973
n/a
1974
n/a
1975
n/a
1976
n/a
1977
n/a
1978
n/a
1979
n/a
1980
n/a
1981
21.0 C (69.8 F)
1982
20.8 C (69.4 F)
1983
22.5 C (72.5 F)
1984
21.2 C (70.2 F)
1985
21.0 C (69.8 F)
1986
21.3 C (70.3 F)
1987
22.0 C (71.6 F)
1988
21.5 C (70.7 F)
1989
20.4 C (68.7 F)
1990
19.9 C (67.8 F)
1991
21.8 C (71.2 F)
1992
21.0 C (69.8 F)
1993
20.9 C (69.6 F)
1994
20.8 C (69.4 F)
1995
18.8 C (65.8 F)
1996
18.8 C (65.8 F)
1997
20.3 C (68.5 F)
1998
20.9 C (69.6 F)
1999
18.6 C (65.5 F)
2000
19.5 C (67.1 F)
2001
20.7 C (69.3 F)
2002
21.0 C (69.8 F)
2003
20.3 C (68.5 F)
2004
21.9 C (71.4 F)
2005
19.4 C (66.9 F)
2006
20.0 C (68.0 F)
2007
19.5 C (67.1 F)
2008
20.7 C (69.3 F)
2009
20.7 C (69.3 F)
2010
21.5 C (70.7 F)
2011
20.7 C (69.3 F)
2012
22.4 C (72.3 F)
2013
21.5 C (70.7 F)
2014
17.8 C (64.0 F)
2015
19.6 C (67.3 F)
2016
20.3 C (68.5 F)
2017
20.2 C (68.4 F)
2018
22.1 C (71.8 F)
2019
20.9 C (69.6 F)
2020
21.7 C (71.1 F)
2021
21.9 C (71.4 F)
2022
20.1 C (68.2 F)
2023
19.4 C (66.9 F)
2024
22.9 C (73.2 F)
2025
20.7 C (69.3 F)
Wettest day (Rx1day)
The wettest day of the year at Ko Samui, 1969 to 2025. The record is 464.1 mm (18.3 in) in 1988, marked on the chart; the median year is 129.0 mm (5.1 in).
Wettest day (Rx1day) at Ko Samui by year
Year
Wettest day (Rx1day)
1969
n/a
1970
n/a
1971
n/a
1972
n/a
1973
119.9 mm (4.7 in)
1974
150.1 mm (5.9 in)
1975
389.9 mm (15.4 in)
1976
130.0 mm (5.1 in)
1977
119.9 mm (4.7 in)
1978
110.0 mm (4.3 in)
1979
230.1 mm (9.1 in)
1980
70.1 mm (2.8 in)
1981
199.9 mm (7.9 in)
1982
55.9 mm (2.2 in)
1983
116.1 mm (4.6 in)
1984
96.0 mm (3.8 in)
1985
54.1 mm (2.1 in)
1986
83.1 mm (3.3 in)
1987
191.0 mm (7.5 in)
1988
464.1 mm (18.3 in)
1989
121.9 mm (4.8 in)
1990
134.1 mm (5.3 in)
1991
90.9 mm (3.6 in)
1992
163.1 mm (6.4 in)
1993
197.1 mm (7.8 in)
1994
156.0 mm (6.1 in)
1995
165.1 mm (6.5 in)
1996
102.1 mm (4.0 in)
1997
94.0 mm (3.7 in)
1998
210.1 mm (8.3 in)
1999
129.0 mm (5.1 in)
2000
66.8 mm (2.6 in)
2001
93.0 mm (3.7 in)
2002
90.7 mm (3.6 in)
2003
129.5 mm (5.1 in)
2004
93.2 mm (3.7 in)
2005
112.0 mm (4.4 in)
2006
102.1 mm (4.0 in)
2007
137.7 mm (5.4 in)
2008
211.3 mm (8.3 in)
2009
154.4 mm (6.1 in)
2010
315.2 mm (12.4 in)
2011
307.3 mm (12.1 in)
2012
105.2 mm (4.1 in)
2013
110.5 mm (4.4 in)
2014
88.4 mm (3.5 in)
2015
55.6 mm (2.2 in)
2016
188.2 mm (7.4 in)
2017
159.3 mm (6.3 in)
2018
177.3 mm (7.0 in)
2019
124.5 mm (4.9 in)
2020
101.6 mm (4.0 in)
2021
159.8 mm (6.3 in)
2022
158.8 mm (6.3 in)
2023
103.9 mm (4.1 in)
2024
207.8 mm (8.2 in)
2025
155.7 mm (6.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Ko Samui, 1969 to 2025. The record is 1,038.1 mm (40.9 in) in 1975, marked on the chart; the median year is 221.9 mm (8.7 in).
Wettest five days (Rx5day) at Ko Samui by year
Year
Wettest five days (Rx5day)
1969
n/a
1970
n/a
1971
n/a
1972
n/a
1973
277.1 mm (10.9 in)
1974
201.9 mm (7.9 in)
1975
1,038.1 mm (40.9 in)
1976
137.0 mm (5.4 in)
1977
169.2 mm (6.7 in)
1978
116.1 mm (4.6 in)
1979
392.9 mm (15.5 in)
1980
125.2 mm (4.9 in)
1981
210.1 mm (8.3 in)
1982
86.9 mm (3.4 in)
1983
125.5 mm (4.9 in)
1984
221.9 mm (8.7 in)
1985
69.9 mm (2.8 in)
1986
194.1 mm (7.6 in)
1987
195.0 mm (7.7 in)
1988
665.1 mm (26.2 in)
1989
200.9 mm (7.9 in)
1990
320.1 mm (12.6 in)
1991
150.1 mm (5.9 in)
1992
237.9 mm (9.4 in)
1993
268.2 mm (10.6 in)
1994
190.0 mm (7.5 in)
1995
266.2 mm (10.5 in)
1996
233.9 mm (9.2 in)
1997
297.7 mm (11.7 in)
1998
419.1 mm (16.5 in)
1999
132.0 mm (5.2 in)
2000
126.8 mm (5.0 in)
2001
115.1 mm (4.5 in)
2002
182.1 mm (7.2 in)
2003
314.7 mm (12.4 in)
2004
217.4 mm (8.6 in)
2005
151.7 mm (6.0 in)
2006
174.4 mm (6.9 in)
2007
390.0 mm (15.4 in)
2008
485.9 mm (19.1 in)
2009
263.1 mm (10.4 in)
2010
466.3 mm (18.4 in)
2011
943.9 mm (37.2 in)
2012
255.8 mm (10.1 in)
2013
244.2 mm (9.6 in)
2014
111.0 mm (4.4 in)
2015
145.1 mm (5.7 in)
2016
467.4 mm (18.4 in)
2017
367.6 mm (14.5 in)
2018
284.0 mm (11.2 in)
2019
178.0 mm (7.0 in)
2020
209.3 mm (8.2 in)
2021
445.2 mm (17.5 in)
2022
348.0 mm (13.7 in)
2023
238.2 mm (9.4 in)
2024
526.1 mm (20.7 in)
2025
221.5 mm (8.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Ko Samui, 1969 to 2025. The record is 55 days in 1990, marked on the chart; the median year is 7 days.
Longest dry spell (CDD) at Ko Samui by year
Year
Longest dry spell (CDD)
1969
n/a
1970
n/a
1971
n/a
1972
n/a
1973
7 days
1974
13 days
1975
3 days
1976
6 days
1977
17 days
1978
21 days
1979
28 days
1980
24 days
1981
6 days
1982
6 days
1983
7 days
1984
19 days
1985
11 days
1986
11 days
1987
11 days
1988
26 days
1989
21 days
1990
55 days
1991
17 days
1992
42 days
1993
28 days
1994
16 days
1995
27 days
1996
40 days
1997
40 days
1998
22 days
1999
8 days
2000
6 days
2001
4 days
2002
11 days
2003
28 days
2004
49 days
2005
19 days
2006
6 days
2007
3 days
2008
4 days
2009
4 days
2010
4 days
2011
4 days
2012
4 days
2013
4 days
2014
4 days
2015
3 days
2016
5 days
2017
6 days
2018
3 days
2019
5 days
2020
5 days
2021
4 days
2022
4 days
2023
5 days
2024
7 days
2025
6 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.
Download the Data
Data for Ko Samui standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ko Samui 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.