Honolulu
Hawaii, USA
Long-term weather forecast
Long-term weather forecast
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August weather forecast and Climate
Honolulu, HI

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Waikiki beach viewed from above, with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance
Waikiki beach viewed from above, with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance
August in Honolulu is almost the driest month of the year, and the peak of summer and has a humidity score of 62%. Temperatures are extremely high with the highest reading 89.6°F (32°C) and the lowest reading of 75.2°F (24°C). Rainfall in August takes a slight rise to an average of 0.5" (12.7mm) with an average of only eight rainy days across the month. There is a small drop in the average sunshine hours per day to ten, but the ocean temperature experiences a rise in its reading to 80.6°F (27°C). This is the hottest month of all, but since the weather is so manageable, most tourists flock the city at this time of year causing crowds at every point, beach, hotels, and streets.
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  • The average high temperature in August: 88.7°F

The warmest month (with the highest average high temperature) is August (88.7°F).
The month with the lowest average high temperature is January (80.1°F).

  • The average low temperature in August: 75.1°F

The month with the highest average low temperature is August (75.1°F).
The coldest month (with the lowest average low temperature) is February (66.1°F).

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  • The average humidity in August: 64.1%

The month with the highest relative humidity is January (73.3%).
The month with the lowest relative humidity is August (64.1%).

  • The average rainfall in August: 8.9"

The wettest month (with the highest rainfall) is March (11.5").
The driest month (with the lowest rainfall) is June (6.2").

  • The average rainfall days in August: 5.6 days

The month with the highest number of rainy days is December (9.7 days).
The month with the lowest number of rainy days is August (5.6 days).

  • The average sea temperature in August: 79.5°F

The best month for swimming (with the highest average sea temperature) is September (80.4°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).

  • The average daylight in August: 13h

Months with the longest days are April, May, June, July and August (Average daylight: 13h).
Months with shortest days are January, February, November and December (Average daylight: 11h).

  • The average sunshine in August: 9.8h

The month with most sunshine is July (Average sunshine: 9.9h).
The month with least sunshine is December (Average sunshine: 6.4h).

  • The average UV index in August: 12

Months with the highest UV index are June, July and August (UV index 12).
The month with the lowest UV index is December (UV index 6).

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