Beware! The reflection of water and sand dramatically increases exposure to the UV rays. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. On bright days sunglasses that block both UVA and UVB rays should be worn. To the extent possible, limit exposure to the direct sun during these hours. Honolulu, HI Weather Conditions starratehome. The Sun's UV radiation is most powerful between 10 a.m. Weather Underground provides local & long-range weather forecasts, weatherreports, maps & tropical weather conditions for the Honolulu area.

Note: The average daily UV index of 6 in May transform into the following instructions: A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for ordinary individuals. UV indexThe months with the lowest UV index in Honolulu are January through June, October through December, with an average maximum UV index of 6. SunshineIn Honolulu, the average sunshine in May is 10.3h. On the last day of May, in Honolulu, sunrise is at 5:48 am and sunset at 7:09 pm HST. On the first day of the month, sunrise is at 6:00 am and sunset at 6:56 pm. DaylightIn Honolulu, the average length of the day in May is 13h and 10min. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods. Hi/Low, RealFeel, precip, radar, & everything you need to be ready for the day. Note: Water temperature between 77☏ (25☌) and 84.2☏ (29☌) is regarded as very warm and enjoyable by all. Get the forecast for today, tonight & tomorrows weather for Honolulu, HI.

Ocean temperatureIn May, the average ocean temperature is 77.9☏ (25.5☌). In Honolulu, during the entire year, the rain falls for 197.2 days and collects up to 14.61' (371mm) of precipitation. Rainfall In Honolulu, Hawaii, in May, it is raining for 17.1 days, with typically 1.18' (30mm) of accumulated precipitation. Read, enjoy and share the latest news in Honolulu and Pearl City on Hawaii Central Press Syndicate. HumidityApril, May, September and November, with an average relative humidity of 74%, are the least humid months in Honolulu. In Honolulu, the average low-temperature is 72.7☏ (22.6☌). TemperatureIn May, the average high-temperature is almost the same as in April - a still moderately hot 78.4☏ (25.8☌). The last month of the spring, May, is also a moderately hot month in Honolulu, Hawaii, with temperature in the range of an average low of 72.7☏ (22.6☌) and an average high of 78.4☏ (25.8☌).

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