December weather in San Joaquin, CA
The average temperature in San Joaquin in December is 47.6°F (36.6°F–58.7°F). Average precipitation: inches.
December is a winter month in San Joaquin, and is cooler than the annual average of 64.3°F. Daily temperatures swing about 22.1°F between overnight low and afternoon high. Daylight averages about 9h 30m. For travel, December is cool.
Avg High
58.7°F
Avg Low
36.6°F
Precipitation
in
Daylight
9h 30m
December records in San Joaquin
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 84.9°F (2020) | 21.0°F (1990) | 0.95 in (1961) |
| December 2 | 84.9°F (2020) | 27.0°F (1945) | 0.37 in (1961) |
| December 3 | 87.1°F (1995) | 25.0°F (2004) | 0.70 in (2014) |
| December 4 | 84.0°F (1995) | 25.0°F (1944) | 0.32 in (1974) |
| December 5 | 82.9°F (1995) | 21.0°F (2013) | 0.56 in (1966) |
| December 6 | 82.0°F (1995) | 21.9°F (1978) | 0.78 in (1992) |
| December 7 | 75.0°F (1995) | 25.0°F (1959) | 0.57 in (1997) |
| December 8 | 75.9°F (1995) | 19.9°F (1978) | 0.65 in (1949) |
| December 9 | 70.0°F (1979) | 18.0°F (1956) | 0.40 in (1983) |
| December 10 | 71.1°F (1996) | 19.0°F (2013) | 0.87 in (1996) |
| December 11 | 73.0°F (1996) | 24.1°F (1978) | 0.45 in (2009) |
| December 12 | 75.9°F (1995) | 19.0°F (1972) | 0.94 in (2014) |
| December 13 | 77.0°F (1995) | 19.0°F (1949) | 0.41 in (2014) |
| December 14 | 78.1°F (1995) | 21.0°F (1945) | 0.66 in (2021) |
| December 15 | 73.9°F (1958) | 21.9°F (1975) | 0.97 in (1988) |
| December 16 | 72.0°F (2023) | 26.1°F (1972) | 1.23 in (2002) |
| December 17 | 69.1°F (1995) | 24.1°F (1975) | 0.65 in (2007) |
| December 18 | 69.1°F (1958) | 26.1°F (1958) | 1.10 in (2010) |
| December 19 | 73.0°F (2025) | 24.1°F (1958) | 0.55 in (2015) |
| December 20 | 75.9°F (1969) | 23.0°F (1990) | 0.63 in (2023) |
| December 21 | 72.0°F (1955) | 12.0°F (1990) | 0.80 in (1996) |
| December 22 | 75.0°F (2005) | 10.9°F (1990) | 0.80 in (1996) |
| December 23 | 72.0°F (1964) | 16.0°F (1990) | 1.25 in (1955) |
| December 24 | 72.0°F (1964) | 12.9°F (1990) | 1.45 in (1955) |
| December 25 | 68.0°F (2013) | 19.9°F (1990) | 0.73 in (1942) |
| December 26 | 70.0°F (1951) | 21.9°F (1956) | 0.39 in (1948) |
| December 27 | 68.0°F (1955) | 23.0°F (1956) | 1.25 in (1946) |
| December 28 | 66.9°F (1951) | 21.9°F (1956) | 0.50 in (1977) |
| December 29 | 71.1°F (1949) | 19.9°F (1990) | 0.89 in (2025) |
| December 30 | 69.1°F (1945) | 21.9°F (1953) | 0.37 in (1996) |
| December 31 | 68.0°F (2025) | 23.0°F (1969) | 0.55 in (2023) |