May weather forecast and climate
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

May, the last month of the spring, in Honolulu, is also a moderately hot month, with average temperature fluctuating between 72.7°F (22.6°C) and 78.4°F (25.8°C).

Temperature

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

Rainfall

In Honolulu, during May, the rain falls for 17.1 days and regularly aggregates up to 1.18" (30mm) of precipitation. Throughout the year, in Honolulu, there are 197.2 rainfall days, and 14.61" (371mm) of precipitation is accumulated.

Ocean temperature

In May, the average ocean temperature in Honolulu is 77.9°F (25.5°C).
Note: 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.

Daylight

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

Sunshine

The average sunshine in Honolulu is 10.3h.

UV index

Months with the lowest UV index are January through June, October through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 6 in May transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 Honolulu, Hawaii, in May, 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?

Months with the lowest humidity in Honolulu are April, May, September and November, with an average relative humidity of 74%.

What is the average humidity in May in Honolulu?

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

How much does it rain in Honolulu in May?

In Honolulu, during May, the rain falls for 17.1 days and regularly aggregates up to 1.18" (30mm) of precipitation.

What is the ocean temperature in May in Honolulu?

In Honolulu, Hawaii, the average seawater temperature in May is 77.9°F (25.5°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

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

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

How long on average sun shines in May in Honolulu?

The average sunshine in May in Honolulu, Hawaii, is 10.3h.

What are the months with the lowest UV index in Honolulu?

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

What is the UV index reading in May in Honolulu?

In Honolulu, Hawaii, the average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to the 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).
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"

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

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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%

Months with the highest relative humidity are February and December (76%).
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

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: 13.2h

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

  • Average sunshine in May: 10.3h

The month with the most sunshine is June (Average sunshine: 10.8h).
Months with the least sunshine are November and December (Average sunshine: 6.5).

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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

Months with the highest UV index are July, August and September (UV index 7).
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).
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

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

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