Weather on December 15
San Mateo, CA
55 Years of Data
Avg High
57°F
Avg Low
43°F
Warmest
2002
58°F avg
Coldest
1972
40°F avg
About This Date
December 15th in San Mateo, CA typically brings cool winter weather, with average highs around 57°F and lows near 43°F. Over 55 years of records, the warmest December 15th was in 2002 (58°F average), while the coldest was 1972 (40°F) — a 18°F range across recorded history. Rain or other precipitation has occurred on about 29% of December 15th dates historically, with the wettest December 15th recording 3.78" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for December 15th in San Mateo, CA? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 52° | 44° | 48° | — | — |
| 2024 | 54° | 43° | 48° | — | — |
| 2023 | 63° | 48° | 55° | — | — |
| 2022 | 56° | 42° | 49° | — | — |
| 2021 | 56° | 44° | 50° | 0.91" | — |
| 2020 | 58° | 46° | 52° | — | — |
| 2019 | 58° | 44° | 51° | — | — |
| 2018 | 62° | 52° | 57° | — | — |
| 2017 | 57° | 44° | 51° | — | — |
| 2016 | 61° | 51° | 56° | 3.78" | — |
| 2015 | 56° | 41° | 48° | — | — |
| 2014 | 63° | 52° | 57° | 3.48" | — |
| 2013 | 60° | 40° | 50° | — | — |
| 2012 | 49° | 40° | 44° | 0.3" | — |
| 2011 | 53° | 43° | 48° | 0.15" | — |
| 2010 | 55° | 43° | 49° | — | — |
| 2009 | 57° | 48° | 53° | — | — |
| 2008 | 52° | 40° | 46° | 0.38" | — |
| 2007 | 53° | 43° | 48° | — | — |
| 2006 | 58° | 49° | 53° | 0.08" | — |
| 2005 | 56° | 40° | 48° | — | — |
| 2004 | 61° | 47° | 54° | — | — |
| 2003 | 54° | 40° | 47° | — | — |
| 2002warmest | 61° | 55° | 58° | 1.12" | — |
| 2001 | 54° | 43° | 48° | — | — |
| 2000 | 59° | 51° | 55° | 0.03" | — |
| 1999 | 55° | 40° | 47° | — | — |
| 1998 | 62° | 41° | 52° | — | — |
| 1997 | 54° | 42° | 48° | — | — |
| 1996 | 61° | 48° | 54° | — | — |
| 1995 | 60° | 49° | 54° | 1.57" | — |
| 1994 | 53° | 43° | 48° | — | — |
| 1993 | 53° | 40° | 46° | — | — |
| 1992 | 58° | 42° | 50° | — | — |
| 1991 | 54° | 41° | 47° | — | — |
| 1990 | 52° | 44° | 48° | 2.18" | — |
| 1989 | 60° | 41° | 51° | — | — |
| 1988 | 58° | 49° | 53° | — | — |
| 1987 | 51° | 41° | 46° | 0.2" | — |
| 1986 | 53° | 45° | 49° | 0.74" | — |
| 1985 | 51° | 37° | 44° | — | — |
| 1984 | 54° | 41° | 47° | 1.27" | — |
| 1983 | 60° | 51° | 56° | — | — |
| 1982 | 58° | 48° | 53° | — | — |
| 1981 | 61° | 48° | 54° | 0.03" | — |
| 1980 | 71° | 40° | 55° | — | — |
| 1979 | 61° | 37° | 49° | — | — |
| 1978 | 63° | 38° | 50° | — | — |
| 1977 | 67° | 45° | 56° | 2.54" | — |
| 1976 | 60° | 34° | 47° | — | — |
| 1975 | 53° | 32° | 43° | — | — |
| 1974 | 59° | 50° | 55° | — | — |
| 1973 | 54° | 40° | 47° | — | — |
| 1972coldest | 47° | 33° | 40° | — | — |
| 1971 | 51° | 35° | 43° | — | — |
55 years of data from BURLINGAME