Honolulu, HI weather in August
Expect hot, humid, mostly dry weather in Honolulu in August, with highs near 89°F and lows near 76°F. Rain falls on about 6 days.
- Normal high
- 89°F
- Normal low
- 76°F
- Wet days
- 6
- 0.8 in total
- Muggy days
- 27
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 89°F | 89°F |
| Normal low | 76°F | 75°F |
| Chance of a wet day | 20% | 21% |
| Sunrise / sunset | 6:04 am / 7:10 pm | 6:14 am / 6:48 pm |
| Daylight | 13.1 h | 12.6 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Hawaii time (no daylight saving)).
A typical August day
- 6 am77°Fdew point 68°F
- 9 am82°Fdew point 68°F
- Noon87°Fdew point 67°F
- 3 pm87°Fdew point 67°F
- 6 pm83°Fdew point 67°F
- 9 pm79°Fdew point 68°F
NOAA hourly normals (local standard time) from Honolulu Intl Airport (5 mi away); average wind 12 mph; clear or few clouds in 34% of daytime hours, mostly cloudy or overcast in 22%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph11 of 31
- Hot dayshigh 90°F or more10 of 31
- Muggy daysdaily mean dew point 65°F or more27 of 31
- Wet daysat least 0.01 in of rain or melted snow6 of 31
- Notable rainat least 0.10 in1 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 0.8 in; a dry August brings about 0.1 in and a wet one about 1.0 in (25th and 75th percentiles). Days with half an inch or more are rare.
How August varies from year to year
- Warmest August, 1991-20201994: average high 91°F
- Coolest August2012: average high 87°F
- Wettest August2015: 7.6 in
- Driest August2003: 0.02 in
- Highest reading95°F (August 31, 2019)
- Lowest reading65°F (August 19, 2009)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 88°F | 89°F | 88°F |
| Normal low | 75°F | 76°F | 75°F |
| Wet days | 7 | 6 | 7 |
| Comfortable days | 0 | 0 | 0 |
| Daylight | 13.3 h | 12.8 h | 12.3 h |
Highs change by +1°F from July and -1°F into September.
Nearby alternatives in August
- Cooler: Hilo, HI210 mi · high 83°F · 27 wet days
How Honolulu ranks in August
- Normal high152nd warmest of 378 cities; 2nd of 7 in Hawaii
- Wet days112th driest of 378
- Comfortable days301st most of 341
What to pack for Honolulu in August
- Light, breathable clothing – highs near 89°F and about 27 muggy days
- A swimsuit – about 11 beach days
Heating and cooling
August has 0 heating degree days and 533 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is Honolulu in August?
The normal high is 89°F and the normal low is 76°F. From 1991 to 2020 the hottest August reading was 95°F (August 31, 2019).
Does it rain a lot in Honolulu in August?
About 6 days in August have at least 0.01 in of precipitation, and the normal total is 0.8 in. The wettest August in 1991-2020 was in 2015 (7.6 in); the driest was in 2003 (0.02 in).
Is August a good time to visit Honolulu?
August ranks 10th of 12 months on our comfort score for Honolulu (47 out of 100). It has almost no comfortable days and about 10 days at 90°F or hotter. The best months are February, March and June.
Where the numbers come from
- Temperature, rain, frost dates, humidity and wind by hour and cloud cover: Honolulu Intl Airport (USW00022521), 4.7 mi WNW of the city center, 7 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Beretania Pump Stn 705 (USC00510211), 0.3 mi E of the city center, 20 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Honolulu International Airport (911820-22521), 5.3 mi WNW of the city center, 6 ft . Hourly observations, 1991-2020.