Annual average weather for Oahu Island, United States

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Annual Average Weather for Oahu Island, United States

The annual average maximum daily temperature is 27.2°C (81.0°F) which is very warm and perfect for sunbathing on clear days. The annual average water temperature is typically 25.9°C (78.7°F) which is warm and pleasant for relaxing and swimming for long periods. Annually there are on average 16.3 days of rain per month and 6.6 hours of sun per day.

When is the best time to visit Oahu Island?

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

The weather is perfect for sunbathing in the months from April to December when the maximum temperature reaches above 26°C (72°F)

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 Oahu Island year round?

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

The weather is best for sunbathing in the months from April to December when the maximum temperature reaches above 26°C (72°F)

More info about the annual temperatures and sunshine.

Can you swim in Oahu Island year round?

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

The warmest sea water temperatures in Oahu Island are found in September when they peak at 27°C (81°F) and lowest in March when they dip to 24°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 Oahu Island?

The hottest month in Oahu Island is August when the average maximum temperature is very warm and perfect for sunbathing on clear days 29°C (84°F), average temperature is 26°C (78°F) and average minimum temperature is 22°C (72°F).

More info about the annual temperatures and sunshine.

When is the coldest month in Oahu Island?

The coolest month in Oahu Island is January when the average maximum temperature is 26°C (78°F), average temperature is 22°C (72°F) and average minimum temperature is 19°C (66°F).

More info about the annual temperatures and sunshine

When is the sunniest month in Oahu Island?

The sunniest days in Oahu Island are in July which has the most hours of sunshine per day. In July the sunshine percentage is 59.8% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 7.5 hours of sunshine per day.

More info about the annual sunshine.

When is the least sunny month in Oahu Island?

December has the least sunshine. In December the sunshine percentage is 47.3% making it quite sunny but with regular periods of cloudy and overcast skies. There are 5.1 hours of sunshine per day.

More info about the annual sunshine.

When is the driest month in Oahu Island?

The driest month in Oahu Island is June with 4cm (1.6inches) of rain and May has the fewest days of rain with 14.4 days with some rain, a pretty wet time to visit the beach.

More info about the annual rainfall

When is the wettest month in Oahu Island?

The wettest month in Oahu Island is March with 16.2cm (6.4inches) of rain and July has the most days of rain with 17.8 days with some rain, a wet time to visit the beach.

More info about the annual rainfall.

When is the sea the coldest in Oahu Island?

The coldest sea water temperatures in Oahu Island are found in March when they dip to 24°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 Oahu Island?

The warmest sea water temperatures in Oahu 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 Oahu Island?

The most humid month in Oahu Island is October with a dew point (an indicator of humidity) of 21°C (70°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 Oahu Island?

The least humid month in Oahu Island is February with a dew point of 19°C (65°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 Oahu Island?

The most windy month in Oahu Island is June when the average maximum windspeed is 29KM/H (18MPH) and the average wind speed is 16KM/H (10MPH).

More info about the annual wind conditions.

Annual Temperature for Oahu Island

The hottest month in Oahu Island is August when the average maximum temperature is 29°C (84°F), average temperature is 26°C (78°F) and average minimum temperature is 22°C (72°F).

The coolest month in Oahu Island is January when the average maximum temperature is 26°C (26°F), average temperature is 22°C (72°F) and average minimum temperature is 19°C (66°F).

Annual Sunshine for Oahu Island

The longest days in Oahu Island are in June, with an average of 13.4 hours of daylight per day. December has the shortest days with an average of 10.8 hours of daylight per day.

The sunniest days in Oahu Island are in July which has the most hours of sunshine per day. The sunshine percentage is 59.8% making it quite sunny but with occasional periods of cloudy and overcast skies. There are 7.5 hours of sunshine per day.

December has the least sunshine. The sunshine percentage is 47.3% making it quite sunny but with regular periods of cloudy and overcast skies. There are 5.1 hours of sunshine per day.

The ultraviolet index is the highest in August when it reaches 13.1 and lowest in December when it reaches 6.4.

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 Oahu Island

The warmest sea water temperatures in Oahu Island are found in September when they peak at 27°C (81°F) and lowest in March when they dip to 24°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 Oahu Island

The wettest month in Oahu Island is March with 16.2cm (6.4inches) of rain and July has the most days of rain with 17.8 days with some rain, a wet time to visit the beach.

The driest month in Oahu Island is June with 4cm (1.6inches) of rain and May has the fewest days of rain with 14.4 days with some rain, a pretty wet time to visit the beach.

Annual Humidity for Oahu Island

The most humid month in Oahu Island is October with a dew point (an indicator of humidity) of 21°C (70°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 Oahu Island is February with a dew point of 19°C (65°F) which is somewhat uncomfortable for most people in cities but fine on a beach.

Annual Wind Speed for Oahu Island

The most windy month in Oahu Island is June when the average maximum windspeed is 29KM/H (18MPH) and the average wind speed is 16KM/H (10MPH).

The least windy month in Oahu Island is October when the average maximum windspeed is 26KM/H (16MPH) and the average wind speed is 13KM/H (8MPH).

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