December weather in South San Francisco, CA
The average temperature in South San Francisco in December is 51.4°F (44.6°F–58.2°F). Average precipitation: 4.14 inches.
December is a winter month in South San Francisco, and is cooler than the annual average of 58.7°F. Daily temperatures swing about 13.6°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 9h 24m. For travel, December is a comfortable month to visit.
Avg High
58.2°F
Avg Low
44.6°F
Precipitation
4.14 in
Daylight
9h 24m
December records in South San Francisco
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 70.0°F (1959) | 37.9°F (1957) | 1.68 in (1951) |
| December 2 | 75.0°F (1958) | 37.0°F (1967) | 1.85 in (2001) |
| December 3 | 73.0°F (1958) | 37.9°F (1956) | 1.89 in (2014) |
| December 4 | 75.0°F (1958) | 36.0°F (2004) | 1.56 in (1945) |
| December 5 | 69.1°F (1979) | 30.9°F (1972) | 1.39 in (1952) |
| December 6 | 66.9°F (1979) | 37.0°F (1947) | 1.41 in (1950) |
| December 7 | 73.0°F (2020) | 33.1°F (1960) | 1.86 in (1997) |
| December 8 | 72.0°F (2020) | 28.9°F (1978) | 1.32 in (2016) |
| December 9 | 66.9°F (1950) | 24.1°F (1972) | 1.17 in (1954) |
| December 10 | 70.0°F (1958) | 28.9°F (1972) | 1.48 in (1996) |
| December 11 | 73.9°F (1958) | 26.1°F (1972) | 3.43 in (2014) |
| December 12 | 75.0°F (1958) | 28.9°F (1972) | 1.16 in (2006) |
| December 13 | 69.1°F (1958) | 30.0°F (1945) | 3.14 in (2021) |
| December 14 | 69.1°F (1958) | 30.0°F (1972) | 1.59 in (2024) |
| December 15 | 71.1°F (1980) | 30.9°F (1967) | 1.49 in (2016) |
| December 16 | 70.0°F (1998) | 33.1°F (1965) | 2.10 in (2002) |
| December 17 | 66.9°F (1958) | 30.0°F (1965) | 1.26 in (2005) |
| December 18 | 64.9°F (1958) | 30.0°F (1965) | 1.77 in (2005) |
| December 19 | 68.0°F (1999) | 32.0°F (1965) | 1.81 in (1952) |
| December 20 | 69.1°F (1999) | 30.9°F (1965) | 1.30 in (2023) |
| December 21 | 68.0°F (1999) | 28.0°F (1990) | 1.73 in (1945) |
| December 22 | 68.0°F (1999) | 27.0°F (1990) | 2.99 in (1955) |
| December 23 | 68.0°F (2014) | 28.0°F (1990) | 1.92 in (2021) |
| December 24 | 64.9°F (1967) | 28.9°F (1990) | 2.00 in (1983) |
| December 25 | 68.0°F (1967) | 30.9°F (1962) | 1.23 in (1968) |
| December 26 | 72.0°F (1967) | 32.0°F (1954) | 1.46 in (1948) |
| December 27 | 70.0°F (1953) | 33.1°F (1954) | 2.24 in (2004) |
| December 28 | 71.1°F (1967) | 32.0°F (1966) | 1.46 in (1991) |
| December 29 | 68.0°F (2013) | 33.1°F (1962) | 2.60 in (2003) |
| December 30 | 69.1°F (1945) | 33.1°F (1978) | 2.19 in (1976) |
| December 31 | 66.9°F (1958) | 28.9°F (1978) | 3.67 in (2022) |