May weather forecast and climate
Hana, HI

May, the last month of the spring, in Hana, is another warm month, with temperature in the range of an average low of 68°F (20°C) and an average high of 80.1°F (26.7°C).

Temperature

In May, the average high-temperature is essentially the same as in April - a still moderately hot 80.1°F (26.7°C). The average low-temperature, in Hana, is 68°F (20°C).

Rainfall

In Hana, during May, the rain falls for 14 days and regularly aggregates up to 5.9" (148.8mm) of precipitation. Throughout the year, in Hana, Hawaii, there are 171 rainfall days, and 82.5" (2096.7mm) of precipitation is accumulated.

Ocean temperature

In May, the average ocean temperature in Hana is 77.4°F (25.2°C).
Note: 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.

Daylight

In May, the average length of the day in Hana is 13.1h.

Sunshine

In Hana, Hawaii, the average sunshine in May is 7h.

UV index

In Hana, the average daily maximum UV index in May is 11. A UV Index of 11, and more, symbolizes an extreme health hazard from the exposure to the Sun's UV rays for the average person.
Note: In May, the average maximum UV index of 11 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.