Honolulu weather in August: Honolulu, Hawaii: normal highs, lows, rain and records for August
Honolulu in August has a normal high of 89°F and a normal low of 76°F, a daily mean of 82°F, holding near 89°F all month. Measurable precipitation falls on 6 days in a normal August, 0.84 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 24°C, 21 mm of precipitation in August.
- NOAA stationHonolulu International Airport
- Station IDUSW00022521
- Location21.32°N 157.93°W
- Elevation7 ft (2 m)
- From the center5 miles
- Population (census place)344,967
- Jan 81° 67°
- Feb 81° 67°
- Mar 81° 68°
- Apr 83° 70°
- May 85° 72°
- Jun 87° 74°
- Jul 88° 75°
- Aug 89° 76°
- Sep 88° 75°
- Oct 87° 74°
- Nov 84° 72°
- Dec 82° 69°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Honolulu in August?
The normal high is 89°F and the normal low 76°F, for a daily mean of 82.2°F. August is 0.6°F warmer than July and 0.6°F warmer than September. August is the warmest month of the year in Honolulu and the 8th wettest. From one year to the next August's mean temperature typically moves about 1.0°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 81°F and 83°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 21%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 89°F | 76°F | 20% | 4% |
| August 8 | 89°F | 76°F | 19% | 4% |
| August 15 | 89°F | 76°F | 19% | 4% |
| August 22 | 89°F | 76°F | 20% | 5% |
| August 31 | 89°F | 75°F | 21% | 6% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 14, coldest night August 29)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 89°F | 76°F | 20% | 4% | 13 h 10 min |
| August 2 | 89°F | 76°F | 20% | 4% | 13 h 10 min |
| August 3 | 89°F | 76°F | 20% | 4% | 13 h |
| August 4 | 89°F | 76°F | 20% | 4% | 13 h |
| August 5 | 89°F | 76°F | 20% | 4% | 13 h |
| August 6 | 89°F | 76°F | 20% | 4% | 13 h |
| August 7 | 89°F | 76°F | 19% | 4% | 13 h |
| August 8 | 89°F | 76°F | 19% | 4% | 13 h |
| August 9 | 89°F | 76°F | 19% | 4% | 13 h |
| August 10 | 89°F | 76°F | 19% | 4% | 13 h |
| August 11 | 89°F | 76°F | 19% | 4% | 13 h |
| August 12 | 89°F | 76°F | 19% | 4% | 13 h |
| August 13 | 89°F | 76°F | 19% | 4% | 13 h |
| August 14 | 89°F | 76°F | 19% | 4% | 12 h 50 min |
| August 15 | 89°F | 76°F | 19% | 4% | 12 h 50 min |
| August 16 | 89°F | 76°F | 19% | 4% | 12 h 50 min |
| August 17 | 89°F | 76°F | 19% | 4% | 12 h 50 min |
| August 18 | 89°F | 76°F | 19% | 4% | 12 h 50 min |
| August 19 | 89°F | 76°F | 19% | 5% | 12 h 50 min |
| August 20 | 89°F | 76°F | 19% | 5% | 12 h 50 min |
| August 21 | 89°F | 76°F | 19% | 5% | 12 h 50 min |
| August 22 | 89°F | 76°F | 20% | 5% | 12 h 50 min |
| August 23 | 89°F | 76°F | 20% | 5% | 12 h 40 min |
| August 24 | 89°F | 75°F | 20% | 5% | 12 h 40 min |
| August 25 | 89°F | 75°F | 20% | 5% | 12 h 40 min |
| August 26 | 89°F | 75°F | 20% | 5% | 12 h 40 min |
| August 27 | 89°F | 75°F | 21% | 6% | 12 h 40 min |
| August 28 | 89°F | 75°F | 21% | 6% | 12 h 40 min |
| August 29 | 89°F | 75°F | 21% | 6% | 12 h 40 min |
| August 30 | 89°F | 75°F | 21% | 6% | 12 h 40 min |
| August 31 | 89°F | 75°F | 21% | 6% | 12 h 40 min |
- Normal high
- 89°FAugust average
- Normal low
- 76°FAugust average
- Precipitation
- 0.84 inmonth total
- Days with precipitation
- 60.01 inch or more
- Days at 90°F or more
- 10
- Daylight
- 13 h 10 min to 12 h 40 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 31
- Sunshine
- 87%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00022521; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Honolulu in August?
On a given August day the chance of 0.01 inch or more is 20% on average, highest around August 31 (21%). In all, 0.84 in falls on 6 days of a normal August.
In a normal August in Honolulu, 10 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00022521.
How humid and windy is Honolulu in August?
At 3 p.m. the normal temperature is 87°F with 52% relative humidity and a dew point of 67°F; at 6 a.m. it is 76°F with 76% humidity. The wind averages 11.0 mph, most often from the east-northeast in the afternoon. A dew point of 65°F or more feels muggy to most people.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 76°F | 68°F | 76% | 7.3 mph | 56% |
| 9 a.m. | 82°F | 68°F | 62% | 11.3 mph | 41% |
| noon | 87°F | 67°F | 53% | 14.5 mph | 31% |
| 3 p.m. | 87°F | 67°F | 52% | 15.3 mph | 37% |
| 6 p.m. | 83°F | 68°F | 61% | 13.6 mph | 43% |
| 9 p.m. | 79°F | 68°F | 69% | 10.4 mph | 55% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00022521. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for August in Honolulu?
The warmest August temperature on Honolulu's official record (since 1940) is 95°F, on August 31, 2019; the coldest is 65°F, on August 19, 2009. The wettest August brought 7.63 in (2015).
The August mean against the 1991-2020 normal of 82.2°F: 2021 81.5°F (−0.8), 2022 81.5°F (−0.7), 2023 82.6°F (+0.4), 2024 82.2°F (at normal), 2025 82.9°F (+0.7), 2026 82.5°F (+0.3). 3 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 81.5°F | −0.8°F | 0.29 in |
| 2022 | 81.5°F | −0.7°F | 0.07 in |
| 2023 | 82.6°F | +0.4°F | 0.11 in |
| 2024 | 82.2°F | at normal | 0.15 in |
| 2025 | 82.9°F | +0.7°F | 0.00 in |
| 2026 | 82.5°F | +0.3°F | 0.91 in |
Source: records: ACIS, NWS threaded record HNLthr; recent months: ACIS, station USW00022521. Records and recent months use complete months only.
How does August in Honolulu compare across Hawaii?
Across the 18 places PlainClimate covers in Hawaii, August normal highs run from 76°F in Kula to 90°F in Kahului; Honolulu's is 89°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.