Weather in Honolulu in August 2025
Average weather
Average temperature in Honolulu in August
Going from a maximum of +32°C during the day to a minimum of +22°C during the night, the temperature in August averages around +30°C.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +30°C to +30°C.
Is Honolulu warm or cold in August?
Honolulu is typically warm in August.
Maximum temperatures go up compared to the previous month from +30°C to +30°C. The minimum temperature also goes up from +24°C to +24°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
August is one of the warmest months in Honolulu, here is the comparison with other months:
Water temperature in Honolulu in August
Water in Honolulu in August is Warm. It varies from +26°C to +27°C, with an average of +26°C. This is almost similar to the air temperature, which averages +30°C.
The water temperature in August is one of the warmest of the entire year:
Can you swim in Honolulu in August?
Climate in Honolulu in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +30°C | +30°C | +30°C | ||||
| Min. temperature | ||||||
| +20°C | +20°C | +20°C | ||||
| Max. temperature | ||||||
| +33°C | +33°C | +34°C | ||||
| Rainfall | ||||||
| 17 mm | 19 mm | 26 mm | ||||
| Wind | ||||||
| 5 m/s | 5 m/s | 4 m/s | ||||
| Avg. water temperature | ||||||
| +26°C | +26°C | +27°C | ||||
| Humidity | ||||||
| 68% | 68% | 69% | ||||
| Air pressure | ||||||
| 1016 HPa | 1015 HPa | 1014 HPa | ||||
| Sunny days | ||||||
| 4 | 5 | 5 | ||||
| Cloudy days | ||||||
| 15 | 16 | 12 | ||||
| Rainy days | ||||||
| 11 | 10 | 12 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as good as in July. The temperature levels stay the same in the area of +30°C for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 17 mm to 19 mm. Humidity levels don’t change as the month goes on, averaging around 68%. The average wind speed doesn’t change much during August, staying around 5 m/s. The good news is there are likely to be more sunny days in August, from 4 to 5.
September brings much the same weather, it remains good.
Wind
The average wind speed is 5 m/s getting up to 10 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Honolulu is gradually increasing during August, going from 7 m/s to 7 m/s over the course of the month.
Rain
How was the weather last August in Honolulu?
Climate Change over Years
The climate in Honolulu in August has not changed much over the last 43 years.
The average temperature was the lowest in 1983 (+25°C) and the highest in 1988 (+29°C). The driest year was 1983 with only 113 mm of rainfall, and the wettest year was 1982 with 1336 mm.
FAQ
Is August a good time to visit Honolulu?
Can you sunbathe in Honolulu in August?
Can you swim in Honolulu in August?
Is Honolulu rainy in August?
Is it sunny in Honolulu in August?
Other cities in USA
Monthly weather in Honolulu
Source of the data
For this page, we’ve looked at the typical weather in Honolulu, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.