Annual average weather for Honolulu, United States

Annual Temperature for Honolulu

The hottest month in Honolulu is August when the average maximum temperature is 29°, average temperature is 26° and average minimum temperature is 22°.

The coolest month in Honolulu is January when the average maximum temperature is 26°, average temperature is 22° and average minimum temperature is 19°.

Annual Sunshine for Honolulu

The longest days in Honolulu are in June, with an average of 13.4 hours of daylight per day. December has the shortest days with an average of 10.8 hours of daylight per day.

The sunniest days in Honolulu are in July which has the most hours of sunshine per day with an average of 7.5 hours of sunshine per day, making it a quite sunny month with some cloud cover. December has the least sunshine with an average of 5.1 hours of sunshine per day, making it a sunny month that is overcast at times.

The ultraviolet index is the highest in August when it reaches 13.1 and lowest in December when it reaches 6.4.

An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.

Annual Sea Temperature for Honolulu

The warmest sea water temperatures in Honolulu are found in September when they peak at 27° and lowest in March when they dip to 24°.

The sea is best for swimming between June and December when the temperature is above 26° which is warm and pleasant for relaxing and swimming for long periods.

Annual Rainfall for Honolulu

The wettest month in Honolulu is March with 29cm of rain and July has the most days of rain with 18.2 days with some rain, a wet time to visit the beach.

The driest month in Honolulu is June with 7.2cm of rain and May has the fewest days of rain with 14.7 days with some rain, a slightly wet time to visit the beach.

Annual Humidity for Honolulu

The most humid month in Honolulu is October with a dew point (an indicator of humidity) of 21° which is very humid and quite uncomfortable for most unless you are on a beach. At night you would most likely require a fan.

The least humid month in Honolulu is February with a dew point of 19° which is somewhat uncomfortable for most people in cities but fine on a beach.

Annual Wind Speed for Honolulu

The most windy month in Honolulu is June when the average maximum windspeed is 29kmh and the average wind speed is 16kmh.

The least windy month in Honolulu is October when the average maximum windspeed is 26kmh and the average wind speed is 13kmh.

Monthly Averages

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