Weather on March 21
San Mateo, CA
55 Years of Data
Avg High
62°F
Avg Low
48°F
Warmest
1997
65°F avg
Coldest
1973
47°F avg
About This Date
March 21st in San Mateo, CA typically brings mild spring weather, with average highs around 62°F and lows near 48°F. Over 56 years of records, the warmest March 21st was in 1997 (65°F average), while the coldest was 1973 (47°F) — a 18°F range across recorded history. Rain or other precipitation has occurred on about 32% of March 21st dates historically, with the wettest March 21st recording 2.84" 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 March 21st in San Mateo, CA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 75° | 53° | 64° | — | — |
| 2025 | 61° | 46° | 53° | — | — |
| 2024 | 67° | 52° | 59° | — | — |
| 2023 | 56° | 48° | 52° | 2.84" | — |
| 2022 | 65° | 49° | 57° | — | — |
| 2021 | 61° | 44° | 52° | — | — |
| 2020 | 62° | 47° | 54° | — | — |
| 2019 | 61° | 46° | 53° | — | — |
| 2018 | 65° | 55° | 60° | 0.33" | — |
| 2017 | 65° | 57° | 61° | 0.71" | — |
| 2016 | 64° | 54° | 59° | 0.03" | — |
| 2015 | 73° | 56° | 64° | — | — |
| 2014 | 65° | 49° | 57° | — | — |
| 2013 | 59° | 44° | 52° | — | — |
| 2012 | 67° | 49° | 58° | — | — |
| 2011 | 57° | 46° | 52° | 0.2" | — |
| 2010 | 63° | 49° | 56° | — | — |
| 2009 | 56° | 48° | 52° | 0.41" | — |
| 2008 | 63° | 43° | 53° | — | — |
| 2007 | 62° | 46° | 54° | — | — |
| 2006 | 55° | 45° | 50° | 0.05" | — |
| 2005 | 60° | 52° | 56° | 1.27" | — |
| 2004 | 64° | 53° | 59° | — | — |
| 2003 | 62° | 49° | 55° | — | — |
| 2002 | 63° | 50° | 56° | — | — |
| 2001 | 63° | 52° | 57° | — | — |
| 2000 | 71° | 53° | 62° | — | — |
| 1999 | 61° | 50° | 55° | 0.1" | — |
| 1998 | 61° | 54° | 57° | 0.25" | — |
| 1997warmest | 74° | 57° | 65° | — | — |
| 1996 | 59° | 46° | 53° | — | — |
| 1995 | 54° | 44° | 49° | 0.43" | — |
| 1994 | 61° | 48° | 54° | — | — |
| 1993 | 63° | 52° | 57° | — | — |
| 1992 | 65° | 55° | 60° | — | — |
| 1991 | 56° | 47° | 51° | 0.56" | — |
| 1990 | 63° | 47° | 55° | — | — |
| 1989 | 64° | 52° | 58° | — | — |
| 1988 | 64° | 51° | 58° | — | — |
| 1987 | 53° | 43° | 48° | 0.89" | — |
| 1986 | 64° | 50° | 57° | — | — |
| 1985 | 58° | 43° | 50° | — | — |
| 1984 | 62° | 46° | 54° | — | — |
| 1983 | 58° | 44° | 51° | — | — |
| 1982 | 58° | 42° | 50° | — | — |
| 1981 | 63° | 50° | 56° | 0.66" | — |
| 1980 | 62° | 45° | 53° | 0.08" | — |
| 1979 | 58° | 49° | 53° | — | — |
| 1978 | 67° | 52° | 59° | 0.48" | — |
| 1977 | 73° | 39° | 56° | — | — |
| 1976 | 64° | 39° | 52° | — | — |
| 1975 | 55° | 42° | 49° | 0.76" | — |
| 1974 | 60° | 47° | 53° | — | — |
| 1973coldest | 61° | 34° | 47° | 0.64" | — |
| 1972 | 65° | 43° | 54° | — | — |
| 1971 | 62° | 43° | 52° | — | — |
56 years of data from BURLINGAME