Annual average weather for Hawaii Island, United States

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Annual Average Weather for Hawaii Island, United States

The annual average maximum daily temperature is 28.0°C (82.5°F) which is very warm and perfect for sunbathing on clear days. The annual average water temperature is typically 25.9°C (78.5°F) which is warm and pleasant for relaxing and swimming for long periods. Annually there are on average 10.4 days of rain per month and 6.9 hours of sun per day.

When is the best time to visit Hawaii Island?

The best months to visit Hawaii Island are June, July, September, October, for the best beach weather, the most sunshine and optimal sunbathing and swimming conditions with the least chance of rain.

The sea is best for swimming between June and November when the sea temperature is above the average 26°C (79°F) which is warm and pleasant for relaxing and swimming for long periods.

Can you sunbathe in Hawaii Island year round?

Yes, you can sunbathe in Hawaii Island all year round.

The coolest month in Hawaii Island is January when the average maximum temperature is 27°C (80°F), average temperature is 23°C (73°F) and average minimum temperature is 19°C (67°F).

More info about the annual temperatures and sunshine.

Can you swim in Hawaii Island year round?

Yes, you can swim in Hawaii Island all year round.

The warmest sea water temperatures in Hawaii Island are found in September when they peak at 27°C (81°F) and lowest in March when they dip to 25°C (76°F).

The sea temperature is above average for swimming between June and November when the sea temperature is above 26°C (79°F) which is warm and pleasant for relaxing and swimming for long periods.

For perfect swimming and lounging all day, try the months from June to November when the sea temperature is above 26°C (79°F)

More info about the annual sea temperatures

When is the hottest month in Hawaii Island?

The hottest month in Hawaii Island is August when the average maximum temperature is very warm and perfect for sunbathing on clear days 29°C (85°F), average temperature is 26°C (79°F) and average minimum temperature is 23°C (73°F).

More info about the annual temperatures and sunshine.

When is the coldest month in Hawaii Island?

The coolest month in Hawaii Island is January when the average maximum temperature is 27°C (80°F), average temperature is 23°C (73°F) and average minimum temperature is 19°C (67°F).

More info about the annual temperatures and sunshine

When is the sunniest month in Hawaii Island?

The sunniest days in Hawaii Island are in June which has the most hours of sunshine per day. In June the sunshine percentage is 62% making it sunny but overcast at times. The hours of sunshine per day are 8.0hrs making the days quite long and bright.

More info about the annual sunshine.

When is the least sunny month in Hawaii Island?

December has the least sunshine. In December the sunshine percentage is 52.7% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 5.7 hours of sunshine per day.

More info about the annual sunshine.

When is the driest month in Hawaii Island?

The driest month in Hawaii Island is July with 5.7cm (2.2inches) of rain and January has the fewest days of rain with 8.5 days with some rain, a quite rainy time to visit the beach.

More info about the annual rainfall

When is the wettest month in Hawaii Island?

The wettest month in Hawaii Island is March with 12.3cm (4.8inches) of rain and the most days of rain with 11.9 days with some rain, a pretty wet time to visit the beach.

More info about the annual rainfall.

When is the sea the coldest in Hawaii Island?

The coldest sea water temperatures in Hawaii Island are found in March when they dip to 25°C (76°F) which is warm and pleasant for relaxing and swimming for long periods.

More info about the annual sea temperatures.

When is the sea the warmest in Hawaii Island?

The warmest sea water temperatures in Hawaii Island are found in September when they peak at 27°C (81°F) which is very warm and ideal for relaxing and swimming for the whole day.

More info about the annual sea temperatures.

When is the most humid month in Hawaii Island?

The most humid month in Hawaii Island is August with a dew point (an indicator of humidity) of 21°C (71°F) which is very humid and quite uncomfortable for most unless you are on a beach. At night you would most likely require a fan.

More info about the annual humidity.

When is the least humid month in Hawaii Island?

The least humid month in Hawaii Island is February with a dew point of 19°C (66°F) which is somewhat uncomfortable for most people in cities but fine on a beach.

More info about the annual humidity.

When is the windiest month in Hawaii Island?

The most windy month in Hawaii Island is March when the average maximum windspeed is 25KM/H (15MPH) and the average wind speed is 11KM/H (7MPH).

More info about the annual wind conditions.

Annual Temperature for Hawaii Island

The hottest month in Hawaii Island is August when the average maximum temperature is 29°C (85°F), average temperature is 26°C (79°F) and average minimum temperature is 23°C (73°F).

The coolest month in Hawaii Island is January when the average maximum temperature is 27°C (27°F), average temperature is 23°C (73°F) and average minimum temperature is 19°C (67°F).

Annual Sunshine for Hawaii Island

The longest days in Hawaii Island are in June, with an average of 13.3 hours of daylight per day. December has the shortest days with an average of 10.9 hours of daylight per day.

The sunniest days in Hawaii Island are in June which has the most hours of sunshine per day. The sunshine percentage is 62% making it sunny but overcast at times. The hours of sunshine per day are 8.0hrs making the days quite long and bright.

December has the least sunshine. The sunshine percentage is 52.7% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 5.7 hours of sunshine per day.

The ultraviolet index is the highest in August when it reaches 13.4 and lowest in December when it reaches 7.

An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.

Annual Sea Temperature for Hawaii Island

The warmest sea water temperatures in Hawaii Island are found in September when they peak at 27°C (81°F) and lowest in March when they dip to 25°C (76°F).

The sea is best for swimming between June and November when the temperature is above 26°C (79°F) which is warm and pleasant for relaxing and swimming for long periods.

Annual Rainfall for Hawaii Island

The wettest month in Hawaii Island is March with 12.3cm (4.8inches) of rain and the most days of rain with 11.9 days with some rain, a pretty wet time to visit the beach.

The driest month in Hawaii Island is July with 5.7cm (2.2inches) of rain and January has the fewest days of rain with 8.5 days with some rain, a quite rainy time to visit the beach.

Annual Humidity for Hawaii Island

The most humid month in Hawaii Island is August with a dew point (an indicator of humidity) of 21°C (71°F) which is very humid and quite uncomfortable for most unless you are on a beach. At night you would most likely require a fan.

The least humid month in Hawaii Island is February with a dew point of 19°C (66°F) which is somewhat uncomfortable for most people in cities but fine on a beach.

Annual Wind Speed for Hawaii Island

The most windy month in Hawaii Island is March when the average maximum windspeed is 25KM/H (15MPH) and the average wind speed is 11KM/H (7MPH).

The least windy month in Hawaii Island is October when the average maximum windspeed is 22KM/H (14MPH) and the average wind speed is 10KM/H (6MPH).

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