Climate averages 1991–2020

Honolulu weather
in May.

A warm, very dry month: the 7th warmest and the 6th driest of the year. Meets the pleasant-weather rule

Long-term climate patterns, not a forecast for a particular trip.

Average high 26.0°C Daytime mean, May

Average low 22.7°C Night-time mean, May

Rainfall 13 mm 2 days with ≥1 mm

Daylight 13 h Sunrise to sunset, per day

May is a warm month in Honolulu: daytime highs average 26.0°C and nights cool to about 22.7°C. By daytime temperature it is the 7th warmest of the 12 months.

Expect about 13 mm of rain on roughly 2 days, which makes May a very dry month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 08 min on an average May day.

Among the 498 cities listed in the United States, Honolulu ranks joint 158th of 498 for the warmest May highs and joint 70th of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Honolulu is 2.2°C warmer than that mean.

From May to June, average highs rise by 0.8°C to 26.8°C, and monthly rainfall falls from 13 mm to 8.0 mm.

The annual picture

May in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Honolulu climate table

1991–2020

Monthly climate averages for Honolulu, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	24.3°C21.3°C	21.3°C	37	4.9	11.011 h
February	24.1°C21.0°C	21.0°C	29	4.5	11.411 h
March	24.3°C21.2°C	21.2°C	39	4.4	12.012 h
April	25.0°C21.9°C	21.9°C	11	2.4	12.613 h
May, selected	26.0°C22.7°C	22.7°C	13	2.2	13.113 h
June	26.8°C23.6°C	23.6°C	8.0	1.1	13.413 h
July	27.3°C24.1°C	24.1°C	5.9	1.0	13.313 h
August	27.7°C24.5°C	24.5°C	9.9	1.8	12.913 h
September	27.8°C24.5°C	24.5°C	10	2.2	12.312 h
October	27.3°C24.2°C	24.2°C	20	2.9	11.712 h
November	26.1°C23.4°C	23.4°C	40	4.9	11.111 h
December	25.0°C22.3°C	22.3°C	47	5.1	10.911 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Honolulu) is explained once on the Honolulu year overview and on the Sources, method and limits page.