May weather forecast
Honolulu, HI

Waikiki beach with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance
Waikiki beach with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance

Weather in May

The last month of the spring, May, is another warm month in Honolulu, Hawaii, with an average temperature varying between 72.7°F (22.6°C) and 78.4°F (25.8°C).

Temperature

In May, the average high-temperature is practically the same as in April - a still moderately hot 78.4°F (25.8°C). In Honolulu, the average low-temperature is 72.7°F (22.6°C).

Humidity

April, May, September and November, with an average relative humidity of 74%, are the least humid months in Honolulu.

Rainfall

In Honolulu, during 17.1 rainfall days, 1.18" (30mm) of precipitation is typically accumulated. In Honolulu, during the entire year, the rain falls for 197.2 days and collects up to 14.61" (371mm) of precipitation.

Ocean temperature

In May, the average ocean temperature is 77.9°F (25.5°C).
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

In Honolulu, the average length of the day in May is 13h and 10min.
On the first day of May in Honolulu, Hawaii, sunrise is at 6:00 am and sunset at 6:56 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 7:09 pm HST.

Sunshine

In May, the average sunshine in Honolulu is 10.3h.

UV index

January through June, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Honolulu. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The average daily UV index of 6 in May transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in May in Honolulu?

In May, in Honolulu, the average high-temperature is 78.4°F (25.8°C), and the average low-temperature is 72.7°F (22.6°C).

What is the least humid month in Honolulu?

April, May, September and November, with an average relative humidity of 74%, are the least humid months in Honolulu, Hawaii.

What is the average humidity in May in Honolulu?

The average relative humidity in May in Honolulu, Hawaii, is 74%.

How many days does it rain in May in Honolulu?

In May, in Honolulu, the rain falls for 17.1 days. Throughout May, 1.18" (30mm) of precipitation is accumulated.

How warm is the water in May in Honolulu?

In May, the average ocean temperature in Honolulu, Hawaii, is 77.9°F (25.5°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

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

The average day length in May in Honolulu, Hawaii, is 13h and 10min.

When are sunrise and sunset in May in Honolulu?

On the first day of May in Honolulu, sunrise is at 6:00 am and sunset at 6:56 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 7:09 pm HST.

How many hours of sunshine does Honolulu have in May?

In May, the average sunshine duration is 10.3h.

When is the lowest UV index in Honolulu?

The months with the lowest UV index in Honolulu, Hawaii, are January through June, October through December, with an average maximum UV index of 6.

How high is the UV index in May in Honolulu?

In Honolulu, Hawaii, the average daily maximum UV index in May is 6. A UV Index reading of 6 to 7 represents a high health threat from exposure to Sun's UV rays.

Average temperature in May
Honolulu, HI

Average temperature in May - Honolulu, HI
  • Average high temperature in May: 78.4°F

The warmest month (with the highest average high temperature) is September (81.5°F).
The months with the lowest average high temperature are February and March (75°F).

  • Average low temperature in May: 72.7°F

The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is February (69.1°F).

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Average pressure in May
Honolulu, HI

Average pressure in May - Honolulu, HI
  • Average pressure in May: 30.04"Hg

The month with the highest atmospheric pressure is April (30.06"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).

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Average wind speed in May
Honolulu, HI

Average wind speed in May - Honolulu, HI
  • Average wind speed in May: 9.7mph

The windiest month (with the highest average wind speed) is July (12.1mph).
The calmest month (with the lowest average wind speed) is January (9mph).

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Average humidity in May
Honolulu, HI

Average humidity in May - Honolulu, HI
  • Average humidity in May: 74%

The months with the highest relative humidity are February and December (76%).
The months with the lowest relative humidity are April, May, September and November (74%).

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Average rainfall in May
Honolulu, HI

Average rainfall in May - Honolulu, HI
  • Average rainfall in May: 1.18"

The wettest months (with the highest rainfall) are March and October (1.81").
The driest month (with the least rainfall) is July (0.67").

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Average rainfall days in May
Honolulu, HI

Average rainfall days in May - Honolulu, HI
  • Average rainfall days in May: 17.1 days

The months with the highest number of rainy days are March and October (18 days).
The month with the least rainy days is January (12.6 days).

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Average sea temperature in May
Honolulu, HI

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).

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Average daylight in May /
Average sunshine in May
Honolulu, HI

Average daylight in May / Average sunshine in May - Honolulu, HI
  • Average daylight in May: 13h and 10min

The month with the longest days is June (Average daylight: 13h and 25min).
The month with the shortest days is December (Average daylight: 10h and 52min).

  • Average sunshine in May: 10h and 18min

The month with the most sunshine is June (Average sunshine: 10h and 48min).
The months with the least sunshine are November and December (Average sunshine: 6h and 30min).

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Average sunshine days in May
Honolulu, HI

Average sunshine days in May - Honolulu, HI
  • Average sunshine days in May: 9.3 days

The month with the most sunshine days is January (12.8 days).
The month with the least sunshine days is October (6.3 days).

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Average UV index in May
Honolulu, HI

Average UV index in May - Honolulu, HI
  • Average UV index in May: 6

The months with the highest UV index are July, August and September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, October, November and December (UV index 6).

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Average cloud cover in May
Honolulu, HI

Average cloud cover in May - Honolulu, HI
  • Average cloud cover in May: 35

The month with the most cloud cover is March (Cloud cover 40).
The months with the least cloud cover are January and September (Cloud cover 33).

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Average visibility in May
Honolulu, HI

Average visibility in May - Honolulu, HI
  • Average visibility in May: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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