May weather forecast
Hanalei, HI

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The vast Taro farm fields in the valley of Hanalei, Hawaii, with beautiful cloudy skies and mountains
The vast Taro farm fields in the valley of Hanalei, Hawaii, with beautiful cloudy skies and mountains

Weather in May

May ushers in the summer season, bringing with it the warmest temperatures Hanalei sees all year. The standout feature in May's weather is an increase in both daytime temperatures to 76.8°F (24.9°C) and sea temperature to 77°F (25°C). Marking the zenith of Hawaii's sun season, it sees over 9 hours of sunshine on average per day throughout the month. Moving ahead, the indications of the broader weather design point towards an even warmer, sunnier June.

Temperature

Hanalei signifies an average high-temperature of a still warm 76.8°F (24.9°C) in May, closely mirroring the 74.8°F (23.8°C) of April. May nights in Hanalei witness a slight temperature decrease, averaging at a pleasant 72.1°F (22.3°C).

Humidity

In May, the average relative humidity is 76%.

Rainfall

In Hanalei, Hawaii, in May, it is raining for 18.5 days, with typically 1.57" (40mm) of accumulated precipitation. In Hanalei, during the entire year, the rain falls for 218.4 days and collects up to 22.13" (562mm) of precipitation.

Ocean temperature

In Hanalei, the average seawater temperature in May is 77°F (25°C).
Note: Engaging in water activities, such as swimming or diving, in temperatures from 77°F (25°C) to 84.2°F (29°C) is very pleasurable for extended periods, without any discomfort.

Daylight

The average length of the day in May in Hanalei is 13h and 13min.
On the first day of the month, sunrise is at 6:05 am and sunset at 7:04 pm. On the last day of May, in Hanalei, sunrise is at 5:53 am and sunset at 7:17 pm HST.

Sunshine

The average sunshine in May in Hanalei is 9.3h.

UV index

The months with the lowest UV index are January through August, October through December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The daily high UV index of 6 during May translates into the following recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Caution! The Sun's UV intensity grows with reflections off sand and water.
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Frequently asked questions

What is the average May temperature in Hanalei?

In Hanalei, 76.8°F (24.9°C) is the average high-temperature and 72.1°F (22.3°C) is the average low-temperature during May.

What is the average humidity in May in Hanalei?

The average relative humidity in May in Hanalei is 76%.

How many days does it rain in May in Hanalei?

In May, in Hanalei, the rain falls for 18.5 days. Throughout May, 1.57" (40mm) of precipitation is accumulated.

How warm is the water in May in Hanalei?

In Hanalei, Hawaii, in May, the average water temperature is 77°F (25°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 Hanalei?

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

When is the sunrise / sunset in May in Hanalei?

In May, on the first day of the month, sunrise is at 6:05 am and sunset at 7:04 pm. On the last day of the month, sunrise is at 5:53 am and sunset at 7:17 pm HST.

How many hours of sunshine does Hanalei have in May?

The average sunshine duration in May is 9.3h.

What is the month with the lowest UV index in Hanalei?

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

How high is the UV index in May in Hanalei?

In Hanalei, the average daily maximum UV index in May is 6. A UV Index of 6 to 7 symbolizes 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
Hanalei, HI

Average temperature in May - Hanalei, HI
  • Average high temperature in May: 76.8°F

The warmest month (with the highest average high temperature) is September (79.7°F).
The months with the lowest average high temperature are February and March (73.2°F).

  • Average low temperature in May: 72.1°F

The month with the highest average low temperature is September (75.9°F).
The coldest month (with the lowest average low temperature) is February (68.5°F).

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Average pressure in May
Hanalei, HI

Average pressure in May - Hanalei, HI
  • Average pressure in May: 30.05"Hg

The month with the highest atmospheric pressure is April (30.07"Hg).
The months with the lowest atmospheric pressure are September and October (29.98"Hg).

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Average wind speed in May
Hanalei, HI

Average wind speed in May - Hanalei, HI
  • Average wind speed in May: 10.5mph

The windiest month (with the highest average wind speed) is July (12.3mph).
The calmest month (with the lowest average wind speed) is January (10mph).

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Average humidity in May
Hanalei, HI

Average humidity in May - Hanalei, HI
  • Average humidity in May: 76%

The months with the highest relative humidity are June, July, August, October and December (77%).
The month with the lowest relative humidity is January (75%).

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Average rainfall in May
Hanalei, HI

Average rainfall in May - Hanalei, HI
  • Average rainfall in May: 1.57"

The wettest month (with the highest rainfall) is March (2.52").
The driest month (with the least rainfall) is April (1.3").

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Average rainfall days in May
Hanalei, HI

Average rainfall days in May - Hanalei, HI
  • Average rainfall days in May: 18.5 days

The month with the highest number of rainy days is August (21.1 days).
The month with the least rainy days is January (12.5 days).

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Average sea temperature in May
Hanalei, HI

Average sea temperature in May - Hanalei, HI
  • Average sea temperature in May: 77°F

The best months for swimming (with the highest average sea temperature) are September and October (81°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (75°F).

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

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

The month with the longest days is June (Average daylight: 13h and 30min).
The month with the shortest days is December (Average daylight: 10h and 48min).

  • Average sunshine in May: 9h and 2min

The month with the most sunshine is June (Average sunshine: 9h and 42min).
The month with the least sunshine is November (Average sunshine: 6h and 12min).

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Average sunshine days in May
Hanalei, HI

Average sunshine days in May - Hanalei, HI
  • Average sunshine days in May: 6.7 days

The month with the most sunshine days is January (12.8 days).
The month with the least sunshine days is August (2.9 days).

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Average UV index in May
Hanalei, HI

Average UV index in May - Hanalei, 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
Hanalei, HI

Average cloud cover in May - Hanalei, HI
  • Average cloud cover in May: 41

The month with the most cloud cover is March (Cloud cover 47).
The months with the least cloud cover are January and September (Cloud cover 38).

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Average visibility in May
Hanalei, HI

Average visibility in May - Hanalei, 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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Hanalei, Hawaii, USA

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