Hilo weather in August: Hilo, Hawaii: normal highs, lows, rain and records for August
Hilo in August has a normal high of 83°F and a normal low of 70°F, a daily mean of 77°F, holding near 83°F all month. Measurable precipitation falls on 27 days in a normal August, 11.30 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 28°C and low of 21°C, 287 mm of precipitation in August.
- NOAA stationHilo International Airport 87
- Station IDUSW00021504
- Location19.72°N 155.05°W
- Elevation38 ft (12 m)
- Population (census place)48,223
- Jan 79° 64°
- Feb 78° 64°
- Mar 79° 65°
- Apr 79° 66°
- May 81° 67°
- Jun 82° 69°
- Jul 83° 70°
- Aug 83° 70°
- Sep 83° 70°
- Oct 82° 69°
- Nov 80° 68°
- Dec 79° 66°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Hilo in August?
The normal high is 83°F and the normal low 70°F, for a daily mean of 76.6°F. August is 0.3°F warmer than July and 0.1°F warmer than September. August is the warmest month of the year in Hilo and the 4th 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 76°F and 78°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 88%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 83°F | 70°F | 88% | 60% |
| August 8 | 83°F | 71°F | 88% | 59% |
| August 15 | 83°F | 71°F | 87% | 58% |
| August 22 | 83°F | 70°F | 85% | 57% |
| August 31 | 83°F | 70°F | 83% | 55% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 29)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 83°F | 70°F | 88% | 60% | 13 h |
| August 2 | 83°F | 70°F | 88% | 60% | 13 h |
| August 3 | 83°F | 70°F | 88% | 60% | 13 h |
| August 4 | 83°F | 70°F | 88% | 59% | 13 h |
| August 5 | 83°F | 71°F | 88% | 59% | 13 h |
| August 6 | 83°F | 71°F | 88% | 59% | 13 h |
| August 7 | 83°F | 71°F | 88% | 59% | 13 h |
| August 8 | 83°F | 71°F | 88% | 59% | 13 h |
| August 9 | 83°F | 71°F | 87% | 59% | 12 h 50 min |
| August 10 | 83°F | 71°F | 87% | 59% | 12 h 50 min |
| August 11 | 83°F | 71°F | 87% | 58% | 12 h 50 min |
| August 12 | 83°F | 71°F | 87% | 58% | 12 h 50 min |
| August 13 | 83°F | 71°F | 87% | 58% | 12 h 50 min |
| August 14 | 83°F | 71°F | 87% | 58% | 12 h 50 min |
| August 15 | 83°F | 71°F | 87% | 58% | 12 h 50 min |
| August 16 | 83°F | 71°F | 86% | 58% | 12 h 50 min |
| August 17 | 83°F | 71°F | 86% | 57% | 12 h 50 min |
| August 18 | 83°F | 70°F | 86% | 57% | 12 h 50 min |
| August 19 | 83°F | 70°F | 86% | 57% | 12 h 50 min |
| August 20 | 83°F | 70°F | 86% | 57% | 12 h 40 min |
| August 21 | 83°F | 70°F | 85% | 57% | 12 h 40 min |
| August 22 | 83°F | 70°F | 85% | 57% | 12 h 40 min |
| August 23 | 83°F | 70°F | 85% | 56% | 12 h 40 min |
| August 24 | 83°F | 70°F | 85% | 56% | 12 h 40 min |
| August 25 | 83°F | 70°F | 84% | 56% | 12 h 40 min |
| August 26 | 83°F | 70°F | 84% | 56% | 12 h 40 min |
| August 27 | 83°F | 70°F | 84% | 56% | 12 h 40 min |
| August 28 | 83°F | 70°F | 84% | 56% | 12 h 40 min |
| August 29 | 83°F | 70°F | 83% | 55% | 12 h 40 min |
| August 30 | 83°F | 70°F | 83% | 55% | 12 h 30 min |
| August 31 | 83°F | 70°F | 83% | 55% | 12 h 30 min |
- Normal high
- 83°FAugust average
- Normal low
- 70°FAugust average
- Precipitation
- 11.30 inmonth total
- Days with precipitation
- 270.01 inch or more
- Daylight
- 13 h to 12 h 30 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 30
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00021504; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Hilo in August?
On a given August day the chance of 0.01 inch or more is 86% on average, highest around August 3 (88%). In all, 11.30 in falls on 27 days of a normal August, 2 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00021504.
How humid and windy is Hilo in August?
At 3 p.m. the normal temperature is 82°F with 67% relative humidity and a dew point of 70°F; at 6 a.m. it is 71°F with 85% humidity. The wind averages 6.4 mph, most often from the 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. | 71°F | 66°F | 85% | 5.5 mph | 25% |
| 9 a.m. | 79°F | 69°F | 73% | 5.2 mph | 28% |
| noon | 82°F | 70°F | 67% | 9.0 mph | 29% |
| 3 p.m. | 82°F | 70°F | 67% | 9.5 mph | 33% |
| 6 p.m. | 79°F | 70°F | 73% | 6.5 mph | 30% |
| 9 p.m. | 75°F | 70°F | 84% | 4.6 mph | 22% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00021504. 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 Hilo?
The warmest August temperature on Hilo's official record (since 1949) is 93°F, on August 15, 1950; the coldest is 63°F, on August 1, 1950. The wettest August brought 49.18 in (2018).
The August mean against the 1991-2020 normal of 76.6°F: 2021 77.7°F (+1.1), 2022 76.6°F (at normal), 2023 77.0°F (+0.4), 2024 76.6°F (at normal), 2026 78.2°F (+1.6). 3 of 5 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 77.7°F | +1.1°F | 7.34 in |
| 2022 | 76.6°F | at normal | 5.15 in |
| 2023 | 77.0°F | +0.4°F | 5.35 in |
| 2024 | 76.6°F | at normal | 11.56 in |
| 2026 | 78.2°F | +1.6°F | 20.85 in |
Source: records: ACIS, NWS threaded record ITOthr; recent months: ACIS, station USW00021504. Records and recent months use complete months only.
How does August in Hilo 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; Hilo's is 83°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.