August weather forecast
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

The last month of the summer, August, is another warm month in Honolulu, Hawaii, with temperature in the range of an average low of 75.7°F (24.3°C) and an average high of 81.3°F (27.4°C).

Temperature

In August, the average high-temperature is relatively the same as in July - a still warm 81.3°F (27.4°C). In August, 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°F (30°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With 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 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, differences in body mass, height, and shape, clothing), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

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

Rainfall

In Honolulu, Hawaii, in August, during 16.8 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. Throughout the year, there are 197.2 rainfall days, and 14.61" (371mm) of precipitation is accumulated.

Ocean temperature

In Honolulu, the average seawater temperature in August 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 August, the average length of the day in Honolulu is 12h and 50min.
On the first day of the month, sunrise is at 6:04 am and sunset at 7:10 pm. On the last day of August, in Honolulu, sunrise is at 6:14 am and sunset at 6:48 pm HST.

Sunshine

The average sunshine in August is 8.9h.

UV index

The months with the highest UV index are July through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: In August, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in August in Honolulu?

The average high-temperature, in August, in Honolulu, is 81.3°F (27.4°C), while the average low-temperature is 75.7°F (24.3°C). The average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, in August is estimated at 86°F (30°C).

What is the average humidity in August in Honolulu?

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

How many days does it rain in August in Honolulu?

In Honolulu, Hawaii, in August, it is raining for 16.8 days, with typically 0.98" (25mm) of accumulated precipitation.

What is the water temperature in August in Honolulu?

In Honolulu, the average seawater temperature in August is 79.5°F (26.4°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.

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

The average day length in August in Honolulu, Hawaii, is 12h and 50min.

What time are sunrise and sunset in August in Honolulu?

In August, on the first day of the month, sunrise is at 6:04 am and sunset at 7:10 pm. On the last day of the month, sunrise is at 6:14 am and sunset at 6:48 pm HST.

How many hours of sunshine does Honolulu have in August?

The average sunshine duration in August in Honolulu, Hawaii, 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.

How high is the UV index in August in Honolulu?

In Honolulu, Hawaii, the average daily maximum UV index in August is 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from 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).
The 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"Hg

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

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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%

The months with the highest relative humidity are February and December (76%).
The 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

The 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: 12h and 50min

The month with the longest days is June (Average daylight: 13h and 25min).
The month with the shortest days is December (Average daylight: 10h and 52min).

  • Average sunshine in August: 8h and 54min

The month with the most sunshine is June (Average sunshine: 10h and 48min).
The months with the least sunshine are November and December (Average sunshine: 6h and 30min).

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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

The months with the highest UV index are July, August and September (UV index 7).
The 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).
The 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

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

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