Honolulu
Hawaii, USA
Long-term weather forecast
Long-term weather forecast

August weather forecast and climate
Honolulu, HI

Waikiki beach viewed from above, with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance
Waikiki beach viewed from above, with clear calm waters on the foot of Honolulu city, Hawaii, with the vast cityscape and mountains in the distance
August in Honolulu is almost the driest month of the year, and the peak of summer and has a humidity score of 62%. Temperatures are extremely high with the highest reading 89.6°F (32°C) and the lowest reading of 75.2°F (24°C). Rainfall in August takes a slight rise to an average of 0.5" (12.7mm) with an average of only eight rainy days across the month. There is a small drop in the average sunshine hours per day to ten, but the ocean temperature experiences a rise in its reading to 80.6°F (27°C). This is the hottest month of all, but since the weather is so manageable, most tourists flock the city at this time of year, causing crowds at every point, beach, hotels, and streets.

What is the warmest month in Honolulu?

With an average high-temperature of 88.7°F (31.5°C) and an average low-temperature of 75°F (23.9°C), August is the warmest month in Honolulu, Hawaii.

What is the temperature in August in Honolulu?

In August, in Honolulu, the average high-temperature is 88.7°F (31.5°C), and the average low-temperature is 75°F (23.9°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that combines both air temperature and relative humidity, in August is calculated to 98.8°F (37.1°C).

What is the least humid month in Honolulu?

The least humid month in Honolulu is August, with an average relative humidity of 64.1%.

What is the average humidity in August in Honolulu?

In August, the average relative humidity is 64.1%.

How much does it rain in Honolulu in August?

In Honolulu, Hawaii, in August, during 5.6 rainfall days, 8.9" (225mm) of precipitation is typically accumulated.

What is the ocean temperature in August in Honolulu?

In Honolulu, Hawaii, the average seawater temperature in August 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.

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

In Honolulu, Hawaii, the average length of the day in August is 12.8h.

How long on average sun shines in August in Honolulu?

In Honolulu, the average sunshine in August is 9.8h.

What are the months with the highest UV index in Honolulu?

June through August, with an average maximum UV index of 12, are months with the highest UV index in Honolulu.

What is the UV index reading in August in Honolulu?

The average daily maximum UV index in August in Honolulu, Hawaii, is 12. A UV Index of 11, and more, symbolizes an ultimate hazard to health from the exposure to the Sun's UV radiation.
Average temperature in August - Honolulu, HI
  • Average high temperature in August: 88.7°F

The warmest month (with the highest average high temperature) is August (88.7°F).
The month with the lowest average high temperature is January (80.1°F).

  • Average low temperature in August: 75.1°F

The month with the highest average low temperature is August (75.1°F).
The coldest month (with the lowest average low temperature) is February (66.1°F).

Average humidity in August - Honolulu, HI
  • Average humidity in August: 64.1%

The month with the highest relative humidity is January (73.3%).
The month with the lowest relative humidity is August (64.1%).

Average rainfall in August - Honolulu, HI
  • Average rainfall in August: 8.9"

The wettest month (with the highest rainfall) is March (11.5").
The driest month (with the lowest rainfall) is June (6.2").

Average rainfall days in August - Honolulu, HI
  • Average rainfall days in August: 5.6 days

The month with the highest number of rainy days is December (9.7 days).
The month with the lowest number of rainy days is August (5.6 days).

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).

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 shortest days is December (Average daylight: 10.9h).

  • Average sunshine in August: 9.8h

The month with most sunshine is July (Average sunshine: 9.9h).
The month with least sunshine is December (Average sunshine: 6.4h).

Average UV index in August - Honolulu, HI
  • Average UV index in August: 12

Months with the highest UV index are June, July and August (UV index 12).
The month with the lowest UV index is December (UV index 6).