May weather forecastHanalei, HI
May
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
The transition from April to May brings an average high-temperature of a still warm 76.8°F (24.9°C), barely different from April's 74.8°F (23.8°C). In Hanalei, May nights experience a modest descent in temperature from daily peaks, cooling down to an average of 72.1°F (22.3°C).Humidity
In Hanalei, the average relative humidity in May is 76%.Rainfall
In Hanalei, in May, it is raining for 18.5 days, with typically 1.57" (40mm) of accumulated precipitation. In Hanalei, Hawaii, during the entire year, the rain falls for 218.4 days and collects up to 22.13" (562mm) of precipitation.Ocean temperature
In Hanalei, in May, the average water temperature is 77°F (25°C).Note: For engaging in any water activities, temperatures from 77°F (25°C) to 84.2°F (29°C) are viewed as outstanding and exceptionally pleasing for prolonged durations.
Daylight
In Hanalei, the average length of the day in May 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, sunrise is at 5:53 am and sunset at 7:17 pm HST.
Sunshine
The average sunshine in May is 9.3h.UV index
January through August, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Hanalei. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the average person.Note: A maximum high daily UV index of 6 during May translates into the following directions:
Inhibit overexposure. Warding off sun damage is of utmost importance. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Take note! Sand and water reflections strengthen the Sun's UV exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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).
Average daylight in May /
Average sunshine in May
Hanalei, HI
- Average daylight in May: 13h and 12min
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 18min
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).
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).
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).
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).
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).
