Honolulu
Hawaii, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Honolulu, HI

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 71.6°F (22°C) and the highest at 84.2°F (29°C). 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 1.1" (27.9mm).

What is the temperature in May in Honolulu?

In Honolulu, in May, the average high-temperature is 84.6°F (29.2°C), and the average low-temperature is 70.9°F (21.6°C). In May, the average heat index (a.k.a. 'feels like', 'real feel'), that factores the actual air temperature with the relative humidity, is evaluated at 90.3°F (32.4°C).

What is the average humidity in May in Honolulu?

In May, the average relative humidity in Honolulu is 66.1%.

How much does it rain in Honolulu in May?

In May, the rain falls for 5.8 days. Throughout May, 9" (228mm) of precipitation is accumulated.

How warm is the water in May in Honolulu?

In May, the average ocean temperature in Honolulu is 77.9°F (25.5°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in May in Honolulu?

In Honolulu, the average length of the day in May is 13.2h.

How long on average sun shines in May in Honolulu?

In Honolulu, the average sunshine in May is 9.1h.

What is the UV index reading in May in Honolulu?

The average daily maximum UV index in May in Honolulu, Hawaii, is 11. A UV Index of 11, and more, symbolizes an extreme health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in May - Honolulu, HI
  • 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).

  • 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).

Average humidity in May - Honolulu, HI
  • 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 - Honolulu, HI
  • 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").

Average rainfall days in May - Honolulu, HI
  • 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 - Honolulu, HI
  • 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).

Average daylight in May / Average sunshine in May - Honolulu, HI
  • 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 - Honolulu, HI
  • 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).