May weather forecastHaleiwa, HI
May
Weather in May
May, the last month of the spring in Haleiwa, is also a moderately hot month, with an average temperature varying between 72.9°F (22.7°C) and 78.6°F (25.9°C).Temperature
The transition into May is marked with an average high-temperature of a still moderately hot 78.6°F (25.9°C), showing an insignificant shift from April's 76.8°F (24.9°C). Throughout May, a minimal difference from peak daytime temperatures is noted, marking a steady low-temperature average of 72.9°F (22.7°C).Humidity
May and September, with an average relative humidity of 74%, are the least humid months.Rainfall
In May, in Haleiwa, the rain falls for 17.2 days. Throughout May, 1.02" (26mm) of precipitation is accumulated. Throughout the year, in Haleiwa, there are 190.2 rainfall days, and 11.65" (296mm) of precipitation is accumulated.Ocean temperature
In Haleiwa, Hawaii, in May, the average water temperature is 77.7°F (25.4°C).Note: Water surface temperatures from 77°F (25°C) to 84.2°F (29°C) are considered optimal and extremely delightful for long-lasting pleasure in any water activity.
Daylight
In May, the average length of the day is 13h and 11min.On the first day of May, sunrise is at 6:00 am and sunset at 6:58 pm. On the last day of the month, sunrise is at 5:49 am and sunset at 7:11 pm HST.
Sunshine
In May, the average sunshine is 9.7h.UV index
January through June, August, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Haleiwa. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the average person.Note: During May, 6 as the daily maximum UV index converts into the following advice:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Notice! Sand and water reflections contribute to a stronger UV exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Haleiwa, HI
- Average high temperature in May: 78.6°F
The warmest month (with the highest average high temperature) is September (81.7°F).
The month with the lowest average high temperature is February (75°F).
- Average low temperature in May: 72.9°F
The months with the highest average low temperature are August and September (75.7°F).
The coldest month (with the lowest average low temperature) is February (68.5°F).
Average pressure in May
Haleiwa, HI
- Average pressure in May: 30.04"Hg
The month with the highest atmospheric pressure is April (30.06"Hg).
The month with the lowest atmospheric pressure is October (29.97"Hg).
Average wind speed in May
Haleiwa, HI
- Average wind speed in May: 9.7mph
The windiest month (with the highest average wind speed) is July (11.6mph).
The calmest month (with the lowest average wind speed) is January (9mph).
Average humidity in May
Haleiwa, 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 May and September (74%).
Average rainfall in May
Haleiwa, HI
- Average rainfall in May: 1.02"
The wettest months (with the highest rainfall) are February and October (1.34").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days in May
Haleiwa, HI
- Average rainfall days in May: 17.2 days
The month with the highest number of rainy days is March (17.7 days).
The month with the least rainy days is January (12.5 days).
Average sea temperature in May
Haleiwa, HI
- Average sea temperature in May: 77.7°F
The best month for swimming (with the highest average sea temperature) is September (80.2°F).
The coldest month (with the lowest average sea temperature) is March (75.2°F).
Average daylight in May /
Average sunshine in May
Haleiwa, HI
- Average daylight in May: 13h and 12min
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 48min).
- Average sunshine in May: 9h and 42min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is November (Average sunshine: 6h and 12min).
Average sunshine days in May
Haleiwa, HI
- Average sunshine days in May: 8.5 days
The month with the most sunshine days is January (12.9 days).
The month with the least sunshine days is September (6.5 days).
Average UV index in May
Haleiwa, HI
- Average UV index in May: 6
The months with the highest UV index are July and September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, August, October, November and December (UV index 6).
Average cloud cover in May
Haleiwa, HI
- Average cloud cover in May: 39
The month with the most cloud cover is March (Cloud cover 44).
The months with the least cloud cover are January and September (Cloud cover 37).
Average visibility in May
Haleiwa, 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).
