August weather forecast
Honolulu, HI

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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 experiences a peak in the tropical climate of Honolulu. The temperatures continue to rise, reaching a maximum of 81.3°F (27.4°C), and yield very warm nights. Despite being a peak summer month, the rainfall inches up slightly compared to July, while the sunshine hours subtly decrease. A slight increase in cloud cover does not deter the warm weather, making it a great period for sunbathers and beach goers. August offers enchanting tropical weather and a multitude of outdoor activities to enjoy in Honolulu.

Temperature

With August's arrival, Honolulu notes an average high-temperature of a still moderately hot 81.3°F (27.4°C), closely following the trend of the preceding month. Honolulu's August nights demonstrate minimal variation from the daytime temperatures, with an average of 75.7°F (24.3°C).

Heat index

In August, the heat index is estimated at a tropical 86°F (30°C). Persistent activity under exposure might lead to a feeling of weariness, with subsequent heat cramps.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly relevant to babies and toddlers. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.

Humidity

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

Rainfall

In Honolulu, Hawaii, during August, the rain falls for 16.8 days and regularly aggregates up to 0.98" (25mm) of precipitation. 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: Temperatures between 77°F (25°C) and 84.2°F (29°C) are excellent for swimming, diving, and other water activities, providing comfort and enjoyment for extended periods without discomfort.

Daylight

In August, the average length of the day is 12h and 50min.
On the first day of the month, sunrise is at 6:05 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

In August, the average sunshine is 8.9h.

UV index

July through September, with an average maximum UV index of 7, are months with the highest UV index in Honolulu. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily high UV index of 7 during August translates into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.
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Frequently asked questions

What is the average August temperature in Honolulu?

An average high-temperature, in August, in Honolulu, 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. 'feels like', 'real feel'), which combines relative humidity and air temperature, in August is estimated at 86°F (30°C).

What is the average humidity in August in Honolulu?

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

How many days does it rain in August in Honolulu?

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

How warm is the water in August in Honolulu?

In Honolulu, Hawaii, in August, the average water temperature is 79.5°F (26.4°C). 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.

How many hours of daylight does Honolulu have in August?

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

What time are sunrise and sunset in August in Honolulu?

On the first day of August in Honolulu, sunrise is at 6:05 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?

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

What is the month with the highest UV index in Honolulu?

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

What is the UV index reading in August in Honolulu?

In August, the average daily maximum UV index in Honolulu, Hawaii, is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to Sun's UV rays.

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 5min

The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).

  • Average sunshine in August: 8h and 5min

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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Honolulu, Hawaii, USA

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