Haleiwa, HI weather in August
Haleiwa is warm and humid in August, with rain on most days: highs average 86°F and nights drop to about 70°F. Rain falls on about 22 days. Keep rain gear handy.
- Normal high
- 86°F
- Normal low
- 70°F
- Wet days
- 22
- 3.2 in total
- Muggy days
- 27
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 86°F | 87°F |
| Normal low | 70°F | 70°F |
| Chance of a wet day | 74% | 72% |
| Sunrise / sunset | 6:05 am / 7:12 pm | 6:15 am / 6:50 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 (22 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 mph7 of 31
- Hot dayshigh 90°F or more4 of 31
- Muggy daysdaily mean dew point 65°F or more27 of 31
- Wet daysat least 0.01 in of rain or melted snow22 of 31
- Notable rainat least 0.10 in9 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 3.2 in; a dry August brings about 2.1 in and a wet one about 3.8 in (25th and 75th percentiles). About 1 day brings half an inch or more.
How August varies from year to year
- Warmest August, 1991-20201996: average high 90°F
- Coolest August2011: average high 83°F
- Wettest August1995: 8.6 in
- Driest August2003: 1.3 in
- Highest reading94°F (August 19, 2004)
- Lowest reading60°F (August 13, 1997)
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 | 85°F | 86°F | 86°F |
| Normal low | 70°F | 70°F | 70°F |
| Wet days | 24 | 22 | 21 |
| Comfortable days | 0 | 0 | 0 |
| Daylight | 13.3 h | 12.8 h | 12.3 h |
Highs change by +1°F from July and 0°F into September.
Nearby alternatives in August
- Drier: Honolulu, HI25 mi · high 89°F · 6 wet days
How Haleiwa ranks in August
- Normal high185th warmest of 378 cities; 4th of 7 in Hawaii
- Wet days377th driest of 378
- Comfortable days299th most of 341
What to pack for Haleiwa in August
- Light, breathable clothing – highs near 86°F and about 27 muggy days
- A rain jacket or umbrella – rain on about 22 days
Heating and cooling
August has 0 heating degree days and 415 cooling degree days (base 65°F), 12% of the year's total heating and cooling demand.
Questions
How hot is Haleiwa in August?
The normal high is 86°F and the normal low is 70°F. From 1991 to 2020 the hottest August reading was 94°F (most recently on August 19, 2004).
Does it rain a lot in Haleiwa in August?
About 22 days in August have at least 0.01 in of precipitation, and the normal total is 3.2 in. The wettest August in 1991-2020 was in 1995 (8.6 in); the driest was in 2003 (1.3 in).
Is August a good time to visit Haleiwa?
August ranks 8th of 12 months on our comfort score for Haleiwa (45 out of 100). It has almost no comfortable days and about 4 days at 90°F or hotter. The best months are January, February and March.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Waimea Valley 892.2 (USC00519603), 5.0 mi NE of the city center, 41 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Honolulu Intl Airport (USW00022521), 22 mi SSE of the city center, 7 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Honolulu International Airport (911820-22521), 21 mi SSE of the city center, 6 ft . Hourly observations, 1991-2020.