Hana
Hawaii, USA
Long-term weather forecast
Long-term weather forecast

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.

What is the temperature in May in Hana?

The average high-temperature, in May, is 80.1°F (26.7°C), while the average low-temperature is 68°F (20°C).

How many days does it rain in May in Hana?

In Hana, Hawaii, in May, during 14 rainfall days, 5.9" (148.8mm) of precipitation is typically accumulated.

How warm is the water in May in Hana?

In May, the average ocean temperature in Hana is 77.4°F (25.2°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

How many hours of daylight does Hana have in May?

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

How long on average sun shines in May in Hana?

The average sunshine in May is 7h.

What is the UV index reading in May in Hana?

In May, the average daily maximum UV index in Hana is 11. A UV Index estimate of 11, and higher, represents an extreme health threat from unsafe exposure to the Sun's UV rays.
Average temperature in May - Hana, HI
  • Average high temperature in May: 26.7°C

Warmest months (with the highest average high temperature) are August and September (28.3°C).
Months with the lowest average high temperature are January, February and March (25.6°C).

  • Average low temperature in May: 20°C

The month with the highest average low temperature is August (22.2°C).
The coldest month (with the lowest average low temperature) is February (17.8°C).

Average rainfall in May - Hana, HI
  • Average rainfall in May: 148.8mm

The wettest month (with the highest rainfall) is March (241.8mm).
The driest month (with the lowest rainfall) is June (103.6mm).

Average rainfall days in May - Hana, HI
  • Average rainfall days in May: 14 days

Months with the highest number of rainy days are April, July and August (16 days).
Months with the lowest number of rainy days are January and February (12 days).

Average sea temperature in May - Hana, HI
  • Average sea temperature in May: 25.2°C

The best month for swimming (with the highest average sea temperature) is September (26.7°C).
The coldest month (with the lowest average sea temperature) is March (24.3°C).

Average daylight in May / Average sunshine in May - Hana, HI
  • Average daylight in May: 13.1h

The month with the longest days is June (Average daylight: 13.4h).
The month with shortest days is December (Average daylight: 10.9h).

  • Average sunshine in May: 7h

Months with most sunshine are June, July, August and September (Average sunshine: 8h).
Months with least sunshine are November and December (Average sunshine: 6).

Average UV index in May - Hana, HI
  • Average UV index in May: 11

Months with the highest UV index are June, July and August (UV index 12).
The month with the lowest UV index is December (UV index 6).