Honolulu
Hawaii, USA
Long-term weather forecast
Long-term weather forecast
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May 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
May in Honolulu is a transitional month into summer and is characterized by a further drop in humidity to 64% and a rise in temperatures with the lowest reading averaging 22°C (71.6°F) and the highest at 29°C (84.2°F). It gets warmer, especially with the sun that shines for up to eleven hours a day warming the ocean whose temperatures are steady at 25°. Rainfall in May falls for roughly ten days across the month, and the rain gauge collects an average of 27.9mm (1.1").
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  • The average high temperature in May: 84.6°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 May: 70.9°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 May: 66.1%

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 May: 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 May: 5.8 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 May: 78°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 May: 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 May: 9.1h

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 May: 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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