December weather in Sunnyvale, CA
The average temperature in Sunnyvale in December is 50.5°F (42.1°F–58.9°F). Average precipitation: 2.51 inches.
December is a winter month in Sunnyvale, and is cooler than the annual average of 59.9°F. Daily temperatures swing about 16.8°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 9h 26m. For travel, December is a comfortable month to visit.
Avg High
58.9°F
Avg Low
42.1°F
Precipitation
2.51 in
Daylight
9h 26m
December records in Sunnyvale
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 73.0°F (1959) | 34.0°F (2004) | 1.28 in (1952) |
| December 2 | 75.0°F (1958) | 32.0°F (1948) | 1.25 in (2014) |
| December 3 | 72.0°F (1958) | 34.0°F (1976) | 1.85 in (2014) |
| December 4 | 71.1°F (2003) | 30.9°F (2004) | 0.80 in (1945) |
| December 5 | 78.1°F (2003) | 29.1°F (2013) | 0.80 in (1966) |
| December 6 | 71.1°F (1989) | 33.1°F (2013) | 1.05 in (1992) |
| December 7 | 71.1°F (1975) | 34.0°F (1947) | 1.05 in (1950) |
| December 8 | 72.0°F (1988) | 30.9°F (1951) | 0.89 in (1955) |
| December 9 | 70.0°F (2015) | 28.0°F (1951) | 1.05 in (1954) |
| December 10 | 69.1°F (1958) | 28.9°F (1972) | 0.72 in (1992) |
| December 11 | 73.9°F (1958) | 28.9°F (1972) | 3.36 in (2014) |
| December 12 | 75.0°F (1958) | 27.0°F (1949) | 0.34 in (2006) |
| December 13 | 68.0°F (1953) | 28.9°F (1945) | 0.76 in (2002) |
| December 14 | 72.0°F (1988) | 27.0°F (1945) | 1.25 in (2002) |
| December 15 | 73.0°F (1980) | 30.0°F (1948) | 0.84 in (1957) |
| December 16 | 71.1°F (1998) | 33.1°F (1965) | 1.23 in (2002) |
| December 17 | 71.6°F (2025) | 28.9°F (1965) | 0.88 in (1977) |
| December 18 | 64.9°F (1958) | 30.0°F (1965) | 1.34 in (2005) |
| December 19 | 72.0°F (1969) | 30.9°F (1948) | 1.08 in (1955) |
| December 20 | 75.9°F (1969) | 32.0°F (1949) | 0.92 in (1970) |
| December 21 | 70.0°F (1999) | 27.0°F (1949) | 0.62 in (1945) |
| December 22 | 68.0°F (1999) | 25.0°F (1990) | 2.23 in (1955) |
| December 23 | 69.1°F (2014) | 23.0°F (1990) | 1.52 in (2012) |
| December 24 | 71.1°F (2013) | 26.1°F (1990) | 0.88 in (1983) |
| December 25 | 72.0°F (1967) | 28.0°F (1990) | 0.90 in (1968) |
| December 26 | 75.0°F (1967) | 30.9°F (1949) | 1.52 in (1948) |
| December 27 | 75.0°F (1967) | 29.1°F (2015) | 1.25 in (2004) |
| December 28 | 72.0°F (1967) | 30.0°F (1966) | 1.04 in (1991) |
| December 29 | 68.0°F (1975) | 30.9°F (1949) | 1.24 in (1991) |
| December 30 | 68.0°F (1989) | 28.0°F (1990) | 0.86 in (1952) |
| December 31 | 68.0°F (1958) | 30.0°F (1947) | 0.73 in (2005) |