Weather on March 18
San Mateo, CA
55 Years of Data
Avg High
64°F
Avg Low
47°F
Warmest
2026
67°F avg
Coldest
1982
46°F avg
About This Date
March 18th in San Mateo, CA typically brings mild spring weather, with average highs around 64°F and lows near 47°F. Over 56 years of records, the warmest March 18th was in 2026 (67°F average), while the coldest was 1982 (46°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 29% of March 18th dates historically, with the wettest March 18th recording 1.83" of rain. The last decade has been 1.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.5°F cooler on this date compared to 20-30 years ago.
Planning for March 18th in San Mateo, CA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 81° | 53° | 67° | — | — |
| 2025 | 59° | 42° | 51° | — | — |
| 2024 | 64° | 51° | 58° | — | — |
| 2023 | 64° | 47° | 55° | 0.1" | — |
| 2022 | 67° | 46° | 56° | — | — |
| 2021 | 58° | 51° | 54° | 0.41" | — |
| 2020 | 57° | 47° | 52° | 0.03" | — |
| 2019 | 72° | 50° | 61° | — | — |
| 2018 | 56° | 41° | 48° | — | — |
| 2017 | 69° | 53° | 61° | — | — |
| 2016 | 63° | 52° | 57° | — | — |
| 2015 | 69° | 51° | 60° | — | — |
| 2014 | 71° | 48° | 60° | — | — |
| 2013 | 60° | 45° | 52° | — | — |
| 2012 | 52° | 44° | 48° | — | — |
| 2011 | 56° | 47° | 51° | 1.78" | — |
| 2010 | 73° | 48° | 61° | — | — |
| 2009 | 68° | 48° | 58° | — | — |
| 2008 | 62° | 47° | 54° | — | — |
| 2007 | 61° | 51° | 56° | — | — |
| 2006 | 57° | 43° | 50° | — | — |
| 2005 | 58° | 54° | 56° | 0.76" | — |
| 2004 | 77° | 52° | 64° | — | — |
| 2003 | 61° | 47° | 54° | — | — |
| 2002 | 58° | 43° | 50° | — | — |
| 2001 | 72° | 48° | 60° | — | — |
| 2000 | 67° | 48° | 57° | — | — |
| 1999 | 62° | 48° | 55° | — | — |
| 1998 | 69° | 48° | 59° | — | — |
| 1997 | 72° | 51° | 61° | — | — |
| 1996 | 75° | 52° | 63° | — | — |
| 1995 | 62° | 52° | 57° | 0.43" | — |
| 1994 | 61° | 50° | 55° | — | — |
| 1993 | 64° | 54° | 59° | 0.15" | — |
| 1992 | 66° | 47° | 56° | — | — |
| 1991 | 58° | 41° | 49° | 0.2" | — |
| 1990 | 61° | 48° | 54° | — | — |
| 1989 | 59° | 53° | 56° | 1.83" | — |
| 1988 | 74° | 44° | 59° | — | — |
| 1987 | 56° | 46° | 51° | 0.1" | — |
| 1986 | 69° | 46° | 58° | — | — |
| 1985 | 58° | 45° | 51° | 0.1" | — |
| 1984 | 65° | 45° | 55° | — | — |
| 1983 | 58° | 46° | 52° | 0.48" | — |
| 1982coldest | 53° | 39° | 46° | 0.15" | — |
| 1981 | 54° | 49° | 51° | 1.04" | — |
| 1980 | 62° | 43° | 52° | — | — |
| 1979 | 55° | 49° | 52° | 0.46" | — |
| 1978 | 77° | 54° | 65° | — | — |
| 1977 | 62° | 36° | 49° | — | — |
| 1976 | 64° | 41° | 53° | 0.41" | — |
| 1975 | 67° | 51° | 59° | — | — |
| 1974 | 70° | 46° | 58° | — | — |
| 1973 | 60° | 37° | 49° | — | — |
| 1972 | 67° | 48° | 57° | — | — |
| 1971 | 69° | 45° | 57° | — | — |
56 years of data from BURLINGAME