August weather forecast and climate
Honolulu, HI

Waikiki beach with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance
Waikiki beach with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance

Weather in August

August, the last month of the summer, in Honolulu, is also a moderately hot month, with average temperature fluctuating between 75.7°F (24.3°C) and 81.3°F (27.4°C).

Temperature

In August, the average high-temperature is practically the same as in July - a still warm 81.3°F (27.4°C). In August, in Honolulu, the average low-temperature is 75.7°F (24.3°C).

Heat index

In August, the average heat index is estimated at a hot 86.2°F (30.1°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'apparent temperature', 'feels like', or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, clothing, metabolic differences), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

In August, the average relative humidity is 75%.

Rainfall

In August, the rain falls for 16.8 days. Throughout August, 0.98" (25mm) of precipitation is accumulated. In Honolulu, during the entire year, the rain falls for 197.2 days and collects up to 14.61" (371mm) of precipitation.

Ocean temperature

In August, the average ocean temperature is 79.5°F (26.4°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 Honolulu, the average length of the day is 12.8h.

Sunshine

The average sunshine in Honolulu is 8.9h.

UV index

Months with the highest UV index are July through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to the UV radiation for ordinary individuals.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in August in Honolulu?

In Honolulu, Hawaii, in August, the average high-temperature is 81.3°F (27.4°C), and the average low-temperature is 75.7°F (24.3°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), that combines both air temperature and relative humidity, in August is calculated to 86.2°F (30.1°C).

What is the average humidity in August in Honolulu?

In Honolulu, Hawaii, the average relative humidity in August is 75%.

How much does it rain in Honolulu in August?

In August, the rain falls for 16.8 days. Throughout August, 0.98" (25mm) of precipitation is accumulated.

How warm is the water in August in Honolulu?

In August, the average ocean temperature in Honolulu is 79.5°F (26.4°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in August in Honolulu?

The average length of the day in August in Honolulu is 12.8h.

How long on average sun shines in August in Honolulu?

In Honolulu, the average sunshine in August is 8.9h.

When is the highest UV index in Honolulu?

July through September, with an average maximum UV index of 7, are months with the highest UV index in Honolulu, Hawaii.

What is the UV index intensity in August in Honolulu?

The average daily maximum UV index in August is 7. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation.

Average temperature in August
Honolulu, HI

Average temperature in August - Honolulu, HI
  • Average high temperature in August: 81.3°F

The warmest month (with the highest average high temperature) is September (81.5°F).
Months with the lowest average high temperature are February and March (75°F).

  • Average low temperature in August: 75.7°F

The month with the highest average low temperature is August (75.7°F).
The coldest month (with the lowest average low temperature) is February (69.1°F).

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Average pressure in August
Honolulu, HI

Average pressure in August - Honolulu, HI
  • Average pressure in August: 29.98"

The month with the highest atmospheric pressure is April (30.06").
Months with the lowest atmospheric pressure are September and October (29.97").

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Average wind speed in August
Honolulu, HI

Average wind speed in August - Honolulu, HI
  • Average wind speed in August: 11.4mph

The windiest month (with the highest average wind speed) is July (12.1mph).
The calmest month (with the lowest average wind speed) is January (9mph).

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Average humidity in August
Honolulu, HI

Average humidity in August - Honolulu, HI
  • Average humidity in August: 75%

Months with the highest relative humidity are February and December (76%).
Months with the lowest relative humidity are April, May, September and November (74%).

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Average rainfall in August
Honolulu, HI

Average rainfall in August - Honolulu, HI
  • Average rainfall in August: 0.98"

The wettest months (with the highest rainfall) are March and October (1.81").
The driest month (with the least rainfall) is July (0.67").

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Average rainfall days in August
Honolulu, HI

Average rainfall days in August - Honolulu, HI
  • Average rainfall days in August: 16.8 days

Months with the highest number of rainy days are March and October (18 days).
The month with the least rainy days is January (12.6 days).

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Average sea temperature in August
Honolulu, HI

Average sea temperature in August - Honolulu, HI
  • Average sea temperature in August: 79.5°F

The best month for swimming (with the highest average sea temperature) is September (80.4°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).

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Average daylight in August /
Average sunshine in August
Honolulu, HI

Average daylight in August / Average sunshine in August - Honolulu, HI
  • Average daylight in August: 12.8h

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

  • Average sunshine in August: 8.9h

The month with the most sunshine is June (Average sunshine: 10.8h).
Months with the least sunshine are November and December (Average sunshine: 6.5).

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Average sunshine days in August
Honolulu, HI

Average sunshine days in August - Honolulu, HI
  • Average sunshine days in August: 7.4 days

The month with the most sunshine days is January (12.8 days).
The month with the least sunshine days is October (6.3 days).

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Average UV index in August
Honolulu, HI

Average UV index in August - Honolulu, HI
  • Average UV index in August: 7

Months with the highest UV index are July, August and September (UV index 7).
Months with the lowest UV index are January, February, March, April, May, June, October, November and December (UV index 6).

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Average cloud cover in August
Honolulu, HI

Average cloud cover in August - Honolulu, HI
  • Average cloud cover in August: 35

The month with the most cloud cover is March (Cloud cover 40).
Months with the least cloud cover are January and September (Cloud cover 33).

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Average visibility in August
Honolulu, HI

Average visibility in August - Honolulu, HI
  • Average visibility in August: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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