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Rainfall totals Honolulu, HI

For Honolulu, the official rainfall for the year to date is 22.03 inches through Aug 21, 2026, according to the National Weather Service daily climate report. The normal for that date is 9.25 inches.

Data from Honolulu International Airport, with records back to 1940.

Official rainfall report for Aug 21, 2026

National Weather Service daily climate report for Honolulu, Aug 21, 2026
MeasuredNormal
Rain on Aug 21, 2026T0.03 inches
Month to date0.91 inches0.50 inches
Year to date22.03 inches9.25 inches
Record for Aug 210.27 inches1978

Source: National Weather Service daily climate report for HONOLULU_INTL/OAHU_(ASOS), issued the morning after Aug 21, 2026. The local National Weather Service office issues the daily climate report for the airport station the next morning, and that report is the official figure.

Days with measurable rain, 2026

Days with measurable rain in Honolulu during 2026, newest first
DateRainfall
Aug 16, 20260.85 inches
Aug 15, 20260.06 inches
Jul 14, 20260.02 inches
Jun 23, 20260.26 inches
Jun 14, 20260.02 inches
Jun 2, 20260.04 inches
May 30, 20260.02 inches
May 29, 20260.01 inches
May 24, 20260.02 inches
May 23, 20260.02 inches
May 15, 20260.44 inches
May 13, 20260.01 inches
May 1, 20260.01 inches
Apr 21, 20260.04 inches
Apr 13, 20260.31 inches
Apr 12, 20260.26 inches
Apr 11, 20260.11 inches
Apr 10, 20260.94 inches
Apr 9, 20260.07 inches
Apr 8, 20260.10 inches
Apr 7, 20261.10 inches
Mar 27, 20260.08 inches
Mar 23, 20260.01 inches
Mar 22, 20260.11 inches
Mar 21, 20260.39 inches
Mar 20, 20262.50 inches
Mar 19, 20260.42 inches
Mar 17, 20260.14 inches
Mar 15, 20260.09 inches
Mar 14, 20261.75 inches

Through Aug 19, 2026, the GHCN-Daily station record shows 22.03 inches of measurable rain so far this year, falling over a 51-day span. Station observations are from GHCN-Daily, with a 1-3 day lag and quality checks by NOAA.

All-time rainfall records

All-time rainfall records for Honolulu since 1940
Wettest day15.32 inchesMar 5, 1958
Wettest year42.78 inches1965
Driest year4.52 inches1998
Average year19.15 inches83 complete years on record
Rain days a year92average, 0.01 inch or more
Record begins194031,299 daily readings

Monthly rainfall normals

Average monthly rainfall for Honolulu, 1991 to 2020
MonthJanFebMarAprMayJunJulAugSepOctNovDecYear
Inches1.841.942.360.770.820.500.520.840.881.512.252.1816.41

Averages are 1991-2020 normals from NCEI.

The daily climate report is issued by the local National Weather Service forecast office and delivered to this page by the Iowa Environmental Mesonet of Iowa State University. Under 17 U.S.C. 105, no copyright attaches to the government-produced figures on this page, including reports, alerts, station observations, and normals, which were created by the National Weather Service and other NOAA offices. The notice that 17 U.S.C. 403 requires appears in this sentence. It does not imply endorsement by or affiliation with those agencies. See: Data sources and attribution.

All Hawaii rainfall totals