Honolulu
Hawaii, USA
Long-term weather forecast
Long-term weather forecast
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September 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
September is still hot with steady temperatures at 75.2°F (24°C) at its coldest and 89.6°F (32°C) at its warmest. The amount of rain increase during the month, raining for an average of eleven days to collect at 0.6" (15.2mm) and are usually light and don't interfere with the warm weather. The sun shines for up to ten hours in the daytime heating the ocean to a steady average of 80.6°F (27°C). Locals indulge more in the ocean and outdoor activities because of the manageable weather outside. The humidity score in September is 65%.
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  • The average high temperature in September: 88.6°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 September: 74.4°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 September: 65.5%

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 September: 6.5"

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 September: 6.9 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 September: 80.4°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 September: 12h

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 September: 9.3h

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 September: 11

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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