May weather forecast and climate
Honolulu, HI US

• Average high temperature in May: 29.2°C

The warmest month (with the highest average high temperature) is August (31.5°C).
The month with the lowest average high temperature is January (26.7°C).

• Average low temperature in May: 21.6°C

The month with the highest average low temperature is August (23.9°C).
The coldest month (with the lowest average low temperature) is February (18.9°C).

• 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%).

• Average rainfall in May: 228mm

The wettest month (with the highest rainfall) is March (291mm).
The driest month (with the lowest rainfall) is June (158mm).

• 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).

• Average sea temperature in May: 25.5°C

The best month for swimming (with the highest average sea temperature) is September (26.9°C).
The coldest month (with the lowest average sea temperature) is March (24.3°C).

• Average daylight in May: 13.2h

The month with the longest days is June (Average daylight: 13.4h).
The month with shortest days is December (Average daylight: 10.9h).

• 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).

• 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).