Weather on May 9
San Mateo, CA
55 Years of Data
Avg High
67°F
Avg Low
50°F
Warmest
2024
72°F avg
Coldest
1983
52°F avg
About This Date
May 9th in San Mateo, CA typically brings mild spring weather, with average highs around 67°F and lows near 50°F. Over 55 years of records, the warmest May 9th was in 2024 (72°F average), while the coldest was 1983 (52°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 9% of May 9th dates historically, with the wettest May 9th recording 0.58" of rain. The last decade has been 4.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.8°F warmer on this date compared to 20-30 years ago.
Planning for May 9th in San Mateo, CA? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 51° | 65° | — | — |
| 2024warmest | 84° | 60° | 72° | — | — |
| 2023 | 65° | 53° | 59° | — | — |
| 2022 | 61° | 48° | 54° | — | — |
| 2021 | 76° | 54° | 65° | — | — |
| 2020 | 66° | 50° | 58° | — | — |
| 2019 | 67° | 55° | 61° | — | — |
| 2018 | 67° | 56° | 61° | — | — |
| 2017 | 75° | 51° | 63° | — | — |
| 2016 | 68° | 52° | 60° | — | — |
| 2015 | 65° | 52° | 58° | — | — |
| 2014 | 66° | 54° | 60° | — | — |
| 2013 | 62° | 52° | 57° | — | — |
| 2012 | 64° | 51° | 58° | — | — |
| 2011 | 63° | 47° | 55° | — | — |
| 2010 | 62° | 53° | 58° | 0.03" | — |
| 2009 | 65° | 50° | 57° | — | — |
| 2008 | 59° | 48° | 54° | — | — |
| 2007 | 65° | 50° | 57° | — | — |
| 2006 | 70° | 49° | 59° | — | — |
| 2005 | 63° | 54° | 58° | 0.43" | — |
| 2004 | 67° | 53° | 60° | — | — |
| 2003 | 61° | 48° | 54° | — | — |
| 2002 | 60° | 49° | 54° | — | — |
| 2001 | 68° | 52° | 60° | — | — |
| 2000 | 63° | 53° | 58° | — | — |
| 1999 | 61° | 46° | 53° | — | — |
| 1998 | 61° | 51° | 56° | — | — |
| 1997 | 70° | 51° | 60° | — | — |
| 1996 | 66° | 49° | 57° | — | — |
| 1995 | 60° | 50° | 55° | 0.08" | — |
| 1994 | 63° | 53° | 58° | — | — |
| 1993 | 88° | 50° | 69° | — | — |
| 1992 | 80° | 55° | 68° | — | — |
| 1991 | 63° | 47° | 55° | — | — |
| 1990 | 64° | 52° | 58° | — | — |
| 1989 | 59° | 52° | 55° | — | — |
| 1988 | 69° | 51° | 60° | — | — |
| 1987 | 69° | 54° | 61° | — | — |
| 1986 | 80° | 49° | 64° | — | — |
| 1985 | 62° | 47° | 54° | — | — |
| 1984 | 66° | 51° | 59° | — | — |
| 1983coldest | 61° | 43° | 52° | — | — |
| 1982 | 60° | 46° | 53° | — | — |
| 1981 | 63° | 49° | 56° | — | — |
| 1980 | 59° | 48° | 54° | 0.51" | — |
| 1979 | 66° | 48° | 57° | — | — |
| 1978 | 58° | 48° | 53° | — | — |
| 1977 | 64° | 42° | 53° | 0.58" | — |
| 1976 | 72° | 50° | 61° | — | — |
| 1975 | 70° | 47° | 58° | — | — |
| 1974 | 70° | 46° | 58° | — | — |
| 1973 | 62° | 47° | 54° | — | — |
| 1972 | 78° | 56° | 67° | — | — |
| 1971 | 71° | 49° | 60° | — | — |
55 years of data from BURLINGAME