Grass Valley weather in August: Grass Valley, California: normal highs, lows, rain and records for August
Grass Valley in August has a normal high of 87°F and a normal low of 57°F, a daily mean of 72°F, falling from 89°F on the 1st to 86°F by the 31st. Measurable precipitation falls on 1 days in a normal August, 0.11 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 14°C, 3 mm of precipitation in August.
- NOAA stationGrass Valley #2
- Station IDUSC00043573
- Location39.20°N 121.07°W
- Elevation2,400 ft (732 m)
- Population14,085
- Jan 54° 33°
- Feb 55° 34°
- Mar 58° 37°
- Apr 63° 40°
- May 71° 47°
- Jun 80° 53°
- Jul 88° 58°
- Aug 87° 57°
- Sep 82° 52°
- Oct 72° 44°
- Nov 60° 37°
- Dec 53° 33°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Grass Valley in August?
The normal high is 87°F and the normal low 57°F, for a daily mean of 72.1°F. August is 1.0°F cooler than July and 4.9°F warmer than September. August is the 2nd warmest month of the year in Grass Valley and the 11th wettest. Across the month the normal high falls 3°F, from 89°F on August 1 to 86°F on August 31. From one year to the next August's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 70°F and 74°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 3%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 89°F | 59°F | 2% | 0% |
| August 8 | 88°F | 58°F | 2% | 0% |
| August 15 | 88°F | 57°F | 2% | 1% |
| August 22 | 87°F | 56°F | 3% | 1% |
| August 31 | 86°F | 55°F | 3% | 1% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 89°F | 59°F | 2% | 0% | 14 h 10 min |
| August 2 | 89°F | 59°F | 2% | 0% | 14 h 10 min |
| August 3 | 89°F | 59°F | 2% | 0% | 14 h 10 min |
| August 4 | 89°F | 58°F | 2% | 0% | 14 h 10 min |
| August 5 | 89°F | 58°F | 2% | 0% | 14 h 10 min |
| August 6 | 89°F | 58°F | 2% | 0% | 14 h |
| August 7 | 88°F | 58°F | 2% | 0% | 14 h |
| August 8 | 88°F | 58°F | 2% | 0% | 14 h |
| August 9 | 88°F | 58°F | 2% | 0% | 14 h |
| August 10 | 88°F | 58°F | 2% | 0% | 14 h |
| August 11 | 88°F | 58°F | 2% | 0% | 13 h 50 min |
| August 12 | 88°F | 57°F | 2% | 0% | 13 h 50 min |
| August 13 | 88°F | 57°F | 2% | 0% | 13 h 50 min |
| August 14 | 88°F | 57°F | 2% | 1% | 13 h 50 min |
| August 15 | 88°F | 57°F | 2% | 1% | 13 h 50 min |
| August 16 | 88°F | 57°F | 2% | 1% | 13 h 40 min |
| August 17 | 87°F | 57°F | 2% | 1% | 13 h 40 min |
| August 18 | 87°F | 57°F | 2% | 1% | 13 h 40 min |
| August 19 | 87°F | 56°F | 3% | 1% | 13 h 40 min |
| August 20 | 87°F | 56°F | 3% | 1% | 13 h 30 min |
| August 21 | 87°F | 56°F | 3% | 1% | 13 h 30 min |
| August 22 | 87°F | 56°F | 3% | 1% | 13 h 30 min |
| August 23 | 87°F | 56°F | 3% | 1% | 13 h 30 min |
| August 24 | 87°F | 56°F | 3% | 1% | 13 h 20 min |
| August 25 | 86°F | 56°F | 3% | 1% | 13 h 20 min |
| August 26 | 86°F | 56°F | 3% | 1% | 13 h 20 min |
| August 27 | 86°F | 55°F | 3% | 1% | 13 h 20 min |
| August 28 | 86°F | 55°F | 3% | 1% | 13 h 10 min |
| August 29 | 86°F | 55°F | 3% | 1% | 13 h 10 min |
| August 30 | 86°F | 55°F | 3% | 1% | 13 h 10 min |
| August 31 | 86°F | 55°F | 3% | 1% | 13 h 10 min |
- Normal high
- 87°FAugust average
- Normal low
- 57°FAugust average
- Precipitation
- 0.11 inmonth total
- Days with precipitation
- 10.01 inch or more
- Days at 90°F or more
- 12
- Daylight
- 14 h 10 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 28
- Sunshine
- 97%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00043573; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Grass Valley in August?
On a given August day the chance of 0.01 inch or more is 2% on average, highest around August 31 (3%). In all, 0.11 in falls on 1 days of a normal August.
In a normal August in Grass Valley, 12 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00043573.
What are the records for August in Grass Valley?
The warmest August temperature on this station's record (since 1966) is 108°F, on August 11, 1971; the coldest is 41°F, on August 30, 1989. The wettest August brought 2.34 in (1976).
The August mean against the 1991-2020 normal of 72.1°F: 2021 74.9°F (+2.8), 2022 75.7°F (+3.6), 2023 74.0°F (+1.9), 2024 72.5°F (+0.4), 2025 74.5°F (+2.4), 2026 74.9°F (+2.8). 6 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 74.9°F | +2.8°F | 0.00 in |
| 2022 | 75.7°F | +3.6°F | 0.00 in |
| 2023 | 74.0°F | +1.9°F | 0.19 in |
| 2024 | 72.5°F | +0.4°F | 0.27 in |
| 2025 | 74.5°F | +2.4°F | 0.00 in |
| 2026 | 74.9°F | +2.8°F | 0.00 in |
Source: records: ACIS, station USC00043573; recent months: ACIS, station USC00043573. Records and recent months use complete months only.
How does August in Grass Valley compare across California?
Across the 219 places PlainClimate covers in California, August normal highs run from 63°F in Bodega to 109°F in Needles; Grass Valley's is 87°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Grass Valley in July88°F by day, 58°F at night
- Grass Valley in September82°F by day, 52°F at night
- Grass Valley through the yearEvery month, frost dates, records and recent years
- California in AugustThe statewide normal and the warmest and coolest places
- Needles: California's warmest Augustnormal high 109°F