August weather in Grass Valley, CA
The average temperature in Grass Valley in August is 72.1°F (56.8°F–87.4°F). Average precipitation: 0.11 inches.
August is a summer month in Grass Valley, and is warmer than the annual average of 56.1°F. Daily temperatures swing about 30.6°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 13h 32m. For travel, August is a comfortable month to visit.
Avg High
87.4°F
Avg Low
56.8°F
Precipitation
0.11 in
Daylight
13h 32m
August records in Grass Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| August 1 | 98.1°F (1973) | 44.1°F (1985) | 0.03 in (2003) |
| August 2 | 100.0°F (2017) | 45.0°F (1989) | 0.10 in (2003) |
| August 3 | 99.0°F (1969) | 48.0°F (1976) | 0.44 in (2003) |
| August 4 | 102.0°F (1969) | 46.0°F (1976) | 0.00 in (1967) |
| August 5 | 102.9°F (1998) | 46.9°F (1976) | 0.08 in (1974) |
| August 6 | 100.0°F (1998) | 46.0°F (1976) | 0.02 in (2014) |
| August 7 | 102.0°F (1978) | 46.0°F (1976) | 0.00 in (1967) |
| August 8 | 102.0°F (1978) | 46.0°F (1985) | 0.66 in (1989) |
| August 9 | 104.0°F (1978) | 44.1°F (1976) | 0.28 in (1989) |
| August 10 | 104.0°F (1978) | 46.9°F (1982) | 0.02 in (1999) |
| August 11 | 108.0°F (1971) | 46.9°F (1993) | 0.00 in (1967) |
| August 12 | 100.9°F (1996) | 48.0°F (1985) | 0.00 in (1967) |
| August 13 | 98.1°F (1967) | 48.0°F (1968) | 0.06 in (1991) |
| August 14 | 100.0°F (1967) | 46.9°F (1974) | 0.32 in (1976) |
| August 15 | 102.0°F (1967) | 43.0°F (1987) | 1.82 in (1976) |
| August 16 | 100.9°F (1967) | 45.0°F (1987) | 0.09 in (1993) |
| August 17 | 100.0°F (1967) | 43.0°F (1976) | 0.02 in (2020) |
| August 18 | 100.9°F (2020) | 46.0°F (1976) | 0.40 in (1975) |
| August 19 | 100.9°F (1967) | 45.0°F (1968) | 0.55 in (1968) |
| August 20 | 99.0°F (1967) | 45.0°F (1985) | 0.62 in (1997) |
| August 21 | 97.0°F (2022) | 44.1°F (1968) | 0.20 in (1975) |
| August 22 | 97.0°F (1969) | 42.1°F (1968) | 1.37 in (2003) |
| August 23 | 99.0°F (1969) | 43.0°F (1978) | 0.07 in (1976) |
| August 24 | 99.0°F (1967) | 44.1°F (1978) | 0.11 in (2024) |
| August 25 | 100.0°F (2010) | 45.0°F (1984) | 0.13 in (2024) |
| August 26 | 100.9°F (2010) | 46.0°F (1989) | 0.15 in (1977) |
| August 27 | 98.1°F (2017) | 46.0°F (1975) | 0.05 in (1999) |
| August 28 | 99.0°F (2017) | 46.0°F (1980) | 0.00 in (1967) |
| August 29 | 100.9°F (2017) | 44.1°F (1980) | 0.04 in (2010) |
| August 30 | 98.1°F (1984) | 41.0°F (1989) | 0.06 in (1985) |
| August 31 | 100.9°F (1968) | 43.0°F (1989) | 0.60 in (1984) |