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Data as of 2025-12-31
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Built 2026-10-15 (15 October 2026)

Waikapu 390 Weather Records (USC00519376)

Record envelope, standing records and threshold days for Waikapu 390 (USC00519376), Hawaii, United States, with 109 years of record.

Key Facts for Waikapu 390

  • Waikapu 390 (USC00519376) is a weather station in Hawaii, United States at 20.85 latitude and -156.51 longitude, 147 m (483 ft) above sea level.
  • The station reports from 1916 to 2024, 109 years of record.
  • 0 records set at Waikapu 390 still stand.
  • Records are tracked for prcp: an element needs 30 years of data to be eligible.
  • Waikapu 390 set a daily record precipitation of 78.7 mm (3.1 in) on 17 January 2024.

About the Station

  • Location: Hawaii, United States, 20.85 latitude, -156.51 longitude.
  • Elevation: 147 m (483 ft).
  • Period of record: 1916 to 2024, 109 years.
  • Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Waikapu 390, with 2026 drawn through them The band shows the record high and record low for each calendar day at Waikapu 390. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 000111 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Waikapu 390. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Waikapu 390, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
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Which Years Hold Standing Records

0 standing records
Standing records at Waikapu 390 by the year they were set 0 records at Waikapu 390 still stand. 00000000000
0 records at Waikapu 390 still stand.
Standing records at Waikapu 390 by the year they were set
Year setStanding records

Wettest Day of Each Month

Feb: 219.7 mm (8.6 in)
Record daily precipitation for each month at Waikapu 390 The wettest day on record for each calendar month at Waikapu 390. The most was 219.7 mm (8.6 in) on 22 February 1932. 0100200300 Jan: 136.7 mm (5.4 in), 20 January 1952 Jan Feb: 219.7 mm (8.6 in), 22 February 1932 Feb Mar: 124.5 mm (4.9 in), 24 March 1967 Mar Apr: 146.1 mm (5.8 in), 2 April 1961 Apr May: 100.3 mm (3.9 in), 21 May 1967 May Jun: 46.5 mm (1.8 in), 12 June 1926 Jun Jul: 33.5 mm (1.3 in), 21 July 1924 Jul Aug: 52.3 mm (2.1 in), 2 August 1958 Aug Sep: 66.5 mm (2.6 in), 14 September 2016 Sep Oct: 73.7 mm (2.9 in), 24 October 2017 Oct Nov: 118.1 mm (4.6 in), 13 November 1965 Nov Dec: 212.1 mm (8.4 in), 21 December 2017 Dec
The wettest day on record for each calendar month at Waikapu 390. The most was 219.7 mm (8.6 in) on 22 February 1932.
Record daily precipitation for each month at Waikapu 390
MonthRecord daily precipitation (mm)Date
Jan136.7 mm (5.4 in)20 January 1952
Feb219.7 mm (8.6 in)22 February 1932
Mar124.5 mm (4.9 in)24 March 1967
Apr146.1 mm (5.8 in)2 April 1961
May100.3 mm (3.9 in)21 May 1967
Jun46.5 mm (1.8 in)12 June 1926
Jul33.5 mm (1.3 in)21 July 1924
Aug52.3 mm (2.1 in)2 August 1958
Sep66.5 mm (2.6 in)14 September 2016
Oct73.7 mm (2.9 in)24 October 2017
Nov118.1 mm (4.6 in)13 November 1965
Dec212.1 mm (8.4 in)21 December 2017

Latest Records

20
Latest records at Waikapu 390
DateStationRecordValueBeat old record byOld record stoodSignificance
17 January 2024Waikapu 390, USdaily rain78.7 mm (3.1 in)21.5 mm (0.8 in)60 years38 of 100 (Notable)
9 January 2024Waikapu 390, USdaily rain70.6 mm (2.8 in)33.0 mm (1.3 in)61 years44 of 100 (Notable)
19 July 2023Waikapu 390, USdaily rain6.1 mm (0.24 in)1.8 mm (0.07 in)66 years20 of 100 (Routine)
27 January 2023Waikapu 390, USdaily rain28.7 mm (1.1 in)8.4 mm (0.33 in)93 years42 of 100 (Notable)
17 March 2021Waikapu 390, USdaily rain31.2 mm (1.2 in)3.3 mm (0.13 in)99 years41 of 100 (Notable)
19 January 2021Waikapu 390, USdaily rain99.6 mm (3.9 in)48.8 mm (1.9 in)92 years61 of 100 (Major)
7 February 2020Waikapu 390, USdaily rain46.7 mm (1.8 in)6.3 mm (0.25 in)2 years13 of 100 (Routine)
17 May 2019Waikapu 390, USdaily rain7.6 mm (0.30 in)2.3 mm (0.09 in)53 years20 of 100 (Routine)
1 October 2018Waikapu 390, USdaily rain10.4 mm (0.4 in)5.8 mm (0.23 in)84 years20 of 100 (Routine)
28 September 2018Waikapu 390, USdaily rain11.7 mm (0.5 in)9.2 mm (0.36 in)57 years20 of 100 (Routine)
12 September 2018Waikapu 390, USdaily rain53.3 mm (2.1 in)33.0 mm (1.3 in)92 years68 of 100 (Major)
26 July 2018Waikapu 390, USdaily rain15.2 mm (0.6 in)10.1 mm (0.4 in)89 years20 of 100 (Routine)
26 March 2018Waikapu 390, USdaily rain27.9 mm (1.1 in)1.2 mm (0.05 in)100 years40 of 100 (Notable)
15 February 2018Waikapu 390, USdaily rain106.7 mm (4.2 in)71.6 mm (2.8 in)100 years76 of 100 (Major)
21 December 2017Waikapu 390, USmonthly rain212.1 mm (8.4 in)33.0 mm (1.3 in)92 years61 of 100 (Major)
24 October 2017Waikapu 390, USmonthly rain73.7 mm (2.9 in)10.2 mm (0.4 in)56 years46 of 100 (Notable)
13 October 2017Waikapu 390, USdaily rain3.8 mm (0.15 in)0.8 mm (0.03 in)52 years20 of 100 (Routine)
2 July 2017Waikapu 390, USdaily rain3.6 mm (0.14 in)1.8 mm (0.07 in)60 years20 of 100 (Routine)
28 May 2017Waikapu 390, USdaily rain17.8 mm (0.7 in)14.8 mm (0.6 in)100 years20 of 100 (Routine)
8 March 2017Waikapu 390, USdaily rain34.3 mm (1.4 in)3.8 mm (0.15 in)4 years13 of 100 (Routine)

Extremes by Year

1916 to 2024
Yearly extremes at Waikapu 390: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)219.7 mm (8.6 in)193275.2 mm (3.0 in)66
Wettest five days (Rx5day)355.8 mm (14.0 in)1955123.7 mm (4.9 in)66
Longest dry spell (CDD)140 days193341 days66

Wettest day (Rx1day)

Wettest day (Rx1day) at Waikapu 390 by year The wettest day of the year at Waikapu 390, 1916 to 2024. The record is 219.7 mm (8.6 in) in 1932, marked on the chart; the median year is 75.2 mm (3.0 in). 0100200300192019401960198020002020Record: 219.7 mm (8.6 in) in 1932
The wettest day of the year at Waikapu 390, 1916 to 2024. The record is 219.7 mm (8.6 in) in 1932, marked on the chart; the median year is 75.2 mm (3.0 in).
Wettest day (Rx1day) at Waikapu 390 by year
YearWettest day (Rx1day)
191659.9 mm (2.4 in)
191771.4 mm (2.8 in)
1918138.2 mm (5.4 in)
191944.5 mm (1.8 in)
192086.4 mm (3.4 in)
192163.5 mm (2.5 in)
192267.1 mm (2.6 in)
1923101.6 mm (4.0 in)
192494.0 mm (3.7 in)
1925179.1 mm (7.1 in)
192667.3 mm (2.6 in)
192793.2 mm (3.7 in)
192844.2 mm (1.7 in)
1929103.6 mm (4.1 in)
1930104.1 mm (4.1 in)
193144.5 mm (1.8 in)
1932219.7 mm (8.6 in)
1933118.1 mm (4.6 in)
193453.3 mm (2.1 in)
193530.0 mm (1.2 in)
193671.1 mm (2.8 in)
194910.9 mm (0.4 in)
1950106.7 mm (4.2 in)
1951123.2 mm (4.9 in)
1952136.7 mm (5.4 in)
195333.0 mm (1.3 in)
195449.0 mm (1.9 in)
1955172.7 mm (6.8 in)
195691.4 mm (3.6 in)
1957101.1 mm (4.0 in)
195877.2 mm (3.0 in)
1959133.9 mm (5.3 in)
196044.2 mm (1.7 in)
1961146.1 mm (5.8 in)
196279.8 mm (3.1 in)
196368.8 mm (2.7 in)
196435.3 mm (1.4 in)
1965118.1 mm (4.6 in)
196650.8 mm (2.0 in)
1967124.5 mm (4.9 in)
196874.7 mm (2.9 in)
196951.6 mm (2.0 in)
197036.3 mm (1.4 in)
197180.3 mm (3.2 in)
197295.3 mm (3.8 in)
197348.3 mm (1.9 in)
197465.5 mm (2.6 in)
197549.8 mm (2.0 in)
197649.3 mm (1.9 in)
197756.9 mm (2.2 in)
197878.7 mm (3.1 in)
197968.6 mm (2.7 in)
201132.0 mm (1.3 in)
201275.7 mm (3.0 in)
2013114.3 mm (4.5 in)
2014166.4 mm (6.6 in)
2015103.1 mm (4.1 in)
201669.3 mm (2.7 in)
2017212.1 mm (8.4 in)
2018106.7 mm (4.2 in)
201931.8 mm (1.3 in)
202046.7 mm (1.8 in)
202199.6 mm (3.9 in)
202213.5 mm (0.5 in)
202328.7 mm (1.1 in)
202478.7 mm (3.1 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Waikapu 390 by year The wettest five days of the year at Waikapu 390, 1916 to 2024. The record is 355.8 mm (14.0 in) in 1955, marked on the chart; the median year is 123.7 mm (4.9 in). 0100200300400192019401960198020002020Record: 355.8 mm (14.0 in) in 1955
The wettest five days of the year at Waikapu 390, 1916 to 2024. The record is 355.8 mm (14.0 in) in 1955, marked on the chart; the median year is 123.7 mm (4.9 in).
Wettest five days (Rx5day) at Waikapu 390 by year
YearWettest five days (Rx5day)
1916102.0 mm (4.0 in)
1917136.6 mm (5.4 in)
1918252.2 mm (9.9 in)
191950.3 mm (2.0 in)
1920179.1 mm (7.1 in)
1921123.5 mm (4.9 in)
1922107.2 mm (4.2 in)
1923183.7 mm (7.2 in)
1924127.1 mm (5.0 in)
1925181.1 mm (7.1 in)
192683.8 mm (3.3 in)
1927188.7 mm (7.4 in)
192857.4 mm (2.3 in)
1929164.1 mm (6.5 in)
1930133.8 mm (5.3 in)
193186.8 mm (3.4 in)
1932318.3 mm (12.5 in)
1933287.8 mm (11.3 in)
193467.1 mm (2.6 in)
193553.9 mm (2.1 in)
1936152.4 mm (6.0 in)
194916.7 mm (0.7 in)
1950211.7 mm (8.3 in)
1951150.6 mm (5.9 in)
1952138.5 mm (5.5 in)
195344.5 mm (1.8 in)
195473.8 mm (2.9 in)
1955355.8 mm (14.0 in)
1956139.2 mm (5.5 in)
1957193.3 mm (7.6 in)
1958101.9 mm (4.0 in)
1959226.1 mm (8.9 in)
196073.2 mm (2.9 in)
1961261.1 mm (10.3 in)
1962123.7 mm (4.9 in)
196398.9 mm (3.9 in)
196468.0 mm (2.7 in)
1965198.5 mm (7.8 in)
196685.4 mm (3.4 in)
1967135.9 mm (5.4 in)
1968114.0 mm (4.5 in)
1969132.8 mm (5.2 in)
197044.6 mm (1.8 in)
19712.5 mm (0.10 in)
197246.7 mm (1.8 in)
197387.7 mm (3.5 in)
1974123.7 mm (4.9 in)
197585.3 mm (3.4 in)
1976105.9 mm (4.2 in)
1977152.9 mm (6.0 in)
1978179.3 mm (7.1 in)
1979100.6 mm (4.0 in)
201145.4 mm (1.8 in)
2012137.7 mm (5.4 in)
2013141.0 mm (5.6 in)
2014218.2 mm (8.6 in)
2015154.5 mm (6.1 in)
2016146.8 mm (5.8 in)
2017234.2 mm (9.2 in)
2018112.8 mm (4.4 in)
201918.1 mm (0.7 in)
20201.6 mm (0.06 in)
2021137.2 mm (5.4 in)
20223.1 mm (0.12 in)
202338.6 mm (1.5 in)
20240.0 mm (0.00 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Waikapu 390 by year The longest dry spell of the year at Waikapu 390, 1916 to 2024. The record is 140 days in 1933, marked on the chart; the median year is 41 days. 050100150192019401960198020002020Record: 140 days in 1933
The longest dry spell of the year at Waikapu 390, 1916 to 2024. The record is 140 days in 1933, marked on the chart; the median year is 41 days.
Longest dry spell (CDD) at Waikapu 390 by year
YearLongest dry spell (CDD)
191615 days
191739 days
191830 days
191941 days
192045 days
192148 days
192283 days
192375 days
192426 days
192532 days
192642 days
192729 days
192862 days
192939 days
1930110 days
193144 days
193235 days
1933140 days
193423 days
193541 days
193623 days
194925 days
195063 days
195172 days
195241 days
195360 days
195448 days
195583 days
195633 days
195751 days
195825 days
195937 days
196053 days
196141 days
196261 days
196362 days
196436 days
196522 days
196665 days
196737 days
196843 days
19693 days
197048 days
197158 days
197256 days
197341 days
197452 days
197595 days
197684 days
197770 days
197827 days
197958 days
201134 days
201251 days
201335 days
201437 days
201520 days
201621 days
201722 days
20184 days
20196 days
20205 days
20215 days
20225 days
202324 days
20245 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

42 years, 1917 to 2017

A day with at least 77.0 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 235.3 mm (9.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Waikapu 390: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years77.0 mm (3.0 in)
5 years114.6 mm (4.5 in)
10 years141.3 mm (5.6 in)
25 years177.2 mm (7.0 in)
50 years205.6 mm (8.1 in)Longer than the 42 years of record
100 years235.3 mm (9.3 in)Longer than the 42 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, 42 years of values from 1917 to 2017.

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: 212.1 mm (8.4 in) in 2017; 172.7 mm (6.8 in) in 1955; 166.4 mm (6.6 in) in 2014.

Download the Data

  • Data for Waikapu 390 standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Waikapu 390 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 . Last revised (2025-12-31).