May weather in Grass Valley, CA
The average temperature in Grass Valley in May is 58.8°F (46.8°F–70.8°F). Average precipitation: 2.48 inches.
May is a spring month in Grass Valley, and is warmer than the annual average of 56.1°F. Daily temperatures swing about 24°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 14h 9m. For travel, May is a comfortable month to visit.
Avg High
70.8°F
Avg Low
46.8°F
Precipitation
2.48 in
Daylight
14h 9m
May records in Grass Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 86.0°F (1981) | 27.0°F (1988) | 1.81 in (1995) |
| May 2 | 84.0°F (2013) | 33.1°F (1988) | 1.83 in (2009) |
| May 3 | 84.9°F (2004) | 34.0°F (2003) | 1.24 in (2003) |
| May 4 | 86.0°F (1992) | 30.0°F (1975) | 0.60 in (2009) |
| May 5 | 88.0°F (1992) | 30.9°F (1975) | 2.12 in (2009) |
| May 6 | 87.1°F (1987) | 33.1°F (1968) | 1.18 in (1979) |
| May 7 | 90.0°F (1987) | 32.0°F (1986) | 0.61 in (2000) |
| May 8 | 90.0°F (1987) | 30.9°F (1979) | 1.30 in (2000) |
| May 9 | 91.0°F (1987) | 30.9°F (1983) | 2.17 in (2005) |
| May 10 | 84.0°F (2001) | 33.1°F (2022) | 1.58 in (1980) |
| May 11 | 86.0°F (1987) | 30.9°F (2000) | 0.94 in (2010) |
| May 12 | 87.1°F (1987) | 30.0°F (2022) | 0.37 in (1998) |
| May 13 | 88.0°F (1976) | 37.0°F (1967) | 0.95 in (1995) |
| May 14 | 90.0°F (1972) | 36.0°F (1968) | 0.92 in (1968) |
| May 15 | 89.1°F (1976) | 32.0°F (2011) | 0.68 in (2011) |
| May 16 | 95.0°F (2008) | 33.1°F (2011) | 3.61 in (1996) |
| May 17 | 91.9°F (2008) | 32.0°F (1977) | 0.94 in (1996) |
| May 18 | 93.0°F (2009) | 30.9°F (1974) | 1.29 in (2020) |
| May 19 | 93.0°F (2008) | 32.0°F (1974) | 2.94 in (2005) |
| May 20 | 88.0°F (2008) | 34.0°F (2019) | 1.36 in (1990) |
| May 21 | 89.1°F (2001) | 36.0°F (2019) | 1.47 in (2002) |
| May 22 | 93.0°F (2001) | 30.9°F (2010) | 1.25 in (1996) |
| May 23 | 91.0°F (1967) | 30.9°F (2010) | 0.49 in (1990) |
| May 24 | 90.0°F (2000) | 33.1°F (1980) | 0.84 in (1997) |
| May 25 | 91.0°F (1982) | 35.1°F (1980) | 1.06 in (1998) |
| May 26 | 90.0°F (1982) | 37.0°F (1980) | 0.90 in (2010) |
| May 27 | 90.0°F (1974) | 39.0°F (1998) | 1.11 in (1990) |
| May 28 | 93.0°F (1984) | 37.9°F (1977) | 1.52 in (1990) |
| May 29 | 99.0°F (1984) | 36.0°F (2011) | 1.49 in (1998) |
| May 30 | 91.0°F (1973) | 33.1°F (1988) | 0.54 in (2020) |
| May 31 | 93.9°F (2025) | 36.0°F (1971) | 1.42 in (1990) |