May weather forecast
Pearl City, HI

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Weather in May

Pearl City experiences the onset of the warmer months with May seeing an average high temperature of about 78.6°F (25.9°C). Despite the rise in temperature, weather conditions remain pleasing with cool gusts performing a balancing act. Sea temperatures start to climb, transforming the coastline into an inviting prospect for swimmers and surfers. Sunshine peaks during this time of the year making for more glorious Hawaiian mornings. Rainfall sees a drop from April, reinforcing that summer is indeed around the corner.

Temperature

May's weather displays an average high-temperature of a still moderately hot 78.6°F (25.9°C), slightly varied from April's 76.8°F (24.9°C). Throughout the nights in May, Pearl City notes an average low of 72.1°F (22.3°C), a small dip from the daytime peak.

Humidity

April through June and September, with an average relative humidity of 74%, are the least humid months.

Rainfall

In Pearl City, in May, during 18.4 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. Throughout the year, there are 208.4 rainfall days, and 16.5" (419mm) of precipitation is accumulated.

Ocean temperature

In Pearl City, the average seawater temperature in May is 77.9°F (25.5°C).
Note: Swimming, diving, and other water activities in the temperature range of 77°F (25°C) to 84.2°F (29°C) are perceived as very enjoyable and comfortable for prolonged durations.

Daylight

The average length of the day in May is 13h and 10min.
On the first day of May in Pearl City, Hawaii, sunrise is at 6:00 am and sunset at 6:57 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 7:10 pm HST.

Sunshine

In Pearl City, the average sunshine in May is 9.5h.

UV index

January through August, October through December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: In May, the maximum UV index of 6 suggests these recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Caution! Sand and water surfaces escalate the UV intensity from the Sun.
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Frequently asked questions

What is the temperature in May in Pearl City?

Pearl City in May has an average high-temperature of 78.6°F (25.9°C) and an average low-temperature of 72.1°F (22.3°C).

What is the least humid month in Pearl City?

April through June and September, with an average relative humidity of 74%, are the least humid months.

What is the average humidity in May in Pearl City?

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

How much does it rain in Pearl City in May?

In Pearl City, Hawaii, during May, the rain falls for 18.4 days and regularly aggregates up to 1.46" (37mm) of precipitation.

What is the water temperature in May in Pearl City?

In Pearl City, in May, the average water temperature 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.

How many hours of daylight does Pearl City have in May?

In May, the average day length is 13h and 10min.

When are sunrise and sunset in May in Pearl City?

On the first day of May in Pearl City, Hawaii, sunrise is at 6:00 am and sunset at 6:57 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 7:10 pm HST.

How long on average sun shines in May in Pearl City?

The average sunshine duration in May in Pearl City, Hawaii, is 9.5h.

What are the months with the lowest UV index in Pearl City?

January through August, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Pearl City, Hawaii.

How high is the UV index in May in Pearl City?

In Pearl City, Hawaii, the average daily maximum UV index in May is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Pearl City, HI

Average temperature in May - Pearl City, HI
  • Average high temperature in May: 78.6°F

The warmest months (with the highest average high temperature) are August and September (82°F).
The months with the lowest average high temperature are February and March (75.4°F).

  • Average low temperature in May: 72.1°F

The month with the highest average low temperature is September (75°F).
The coldest month (with the lowest average low temperature) is February (68°F).

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Average pressure in May
Pearl City, HI

Average pressure in May - Pearl City, 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
Pearl City, HI

Average wind speed in May - Pearl City, HI
  • Average wind speed in May: 9.1mph

The windiest month (with the highest average wind speed) is July (11.3mph).
The calmest month (with the lowest average wind speed) is January (8.4mph).

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Average humidity in May
Pearl City, HI

Average humidity in May - Pearl City, 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, June and September (74%).

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Average rainfall in May
Pearl City, HI

Average rainfall in May - Pearl City, HI
  • Average rainfall in May: 1.46"

The wettest month (with the highest rainfall) is October (2.09").
The driest month (with the least rainfall) is July (0.71").

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Average rainfall days in May
Pearl City, HI

Average rainfall days in May - Pearl City, HI
  • Average rainfall days in May: 18.4 days

The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is January (13.5 days).

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Average sea temperature in May
Pearl City, HI

Average sea temperature in May - Pearl City, 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
Pearl City, HI

Average daylight in May / Average sunshine in May - Pearl City, HI
  • Average daylight in May: 13h and 1min

The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).

  • Average sunshine in May: 9h and 3min

The month with the most sunshine is June (Average sunshine: 9h and 54min).
The months with the least sunshine are November and December (Average sunshine: 6h and 18min).

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Average sunshine days in May
Pearl City, HI

Average sunshine days in May - Pearl City, HI
  • Average sunshine days in May: 8.7 days

The month with the most sunshine days is January (12.3 days).
The month with the least sunshine days is November (6.2 days).

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Average UV index in May
Pearl City, HI

Average UV index in May - Pearl City, HI
  • Average UV index in May: 6

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

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Average cloud cover in May
Pearl City, HI

Average cloud cover in May - Pearl City, HI
  • Average cloud cover in May: 40

The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is January (Cloud cover 36).

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Average visibility in May
Pearl City, HI

Average visibility in May - Pearl City, 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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Pearl City, Hawaii, USA

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