Weather on April 9
San Mateo, CA
55 Years of Data
Avg High
65°F
Avg Low
48°F
Warmest
1989
73°F avg
Coldest
1999
46°F avg
About This Date
April 9th in San Mateo, CA typically brings mild spring weather, with average highs around 65°F and lows near 48°F. Over 56 years of records, the warmest April 9th was in 1989 (73°F average), while the coldest was 1999 (46°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 21% of April 9th dates historically, with the wettest April 9th recording 1.04" of rain. The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.0°F warmer on this date compared to 20-30 years ago.
Planning for April 9th 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 |
|---|---|---|---|---|---|
| 2026 | 71° | 54° | 62° | — | — |
| 2025 | 73° | 50° | 62° | — | — |
| 2024 | 71° | 48° | 60° | — | — |
| 2023 | 71° | 49° | 60° | — | — |
| 2022 | 65° | 49° | 57° | — | — |
| 2021 | 59° | 50° | 55° | — | — |
| 2020 | 65° | 50° | 57° | — | — |
| 2019 | 64° | 52° | 58° | — | — |
| 2018 | 75° | 50° | 63° | — | — |
| 2017 | 60° | 45° | 52° | — | — |
| 2016 | 65° | 57° | 61° | 0.51" | — |
| 2015 | 66° | 49° | 57° | — | — |
| 2014 | 64° | 51° | 58° | — | — |
| 2013 | 68° | 50° | 59° | — | — |
| 2012 | 65° | 47° | 56° | — | — |
| 2011 | 58° | 45° | 51° | — | — |
| 2010 | 69° | 45° | 57° | — | — |
| 2009 | 56° | 50° | 53° | 0.03" | — |
| 2008 | 58° | 48° | 53° | — | — |
| 2007 | 62° | 50° | 56° | 0.03" | — |
| 2006 | 61° | 51° | 56° | 0.36" | — |
| 2005 | 62° | 49° | 55° | — | — |
| 2004 | 70° | 48° | 59° | — | — |
| 2003 | 66° | 50° | 58° | — | — |
| 2002 | 62° | 53° | 58° | 0.03" | — |
| 2001 | 58° | 43° | 50° | 1.04" | — |
| 2000 | 62° | 51° | 57° | — | — |
| 1999coldest | 54° | 39° | 46° | — | — |
| 1998 | 62° | 50° | 56° | 0.18" | — |
| 1997 | 60° | 45° | 52° | — | — |
| 1996 | 63° | 52° | 57° | — | — |
| 1995 | 60° | 43° | 51° | — | — |
| 1994 | 60° | 50° | 55° | 0.03" | — |
| 1993 | 64° | 51° | 58° | — | — |
| 1992 | 62° | 53° | 58° | — | — |
| 1991 | 64° | 48° | 56° | — | — |
| 1990 | 73° | 46° | 60° | — | — |
| 1989warmest | 90° | 56° | 73° | — | — |
| 1988 | 84° | 46° | 65° | — | — |
| 1987 | 77° | 48° | 63° | — | — |
| 1986 | 67° | 49° | 58° | — | — |
| 1985 | 62° | 47° | 54° | — | — |
| 1984 | 62° | 40° | 51° | — | — |
| 1983 | 56° | 48° | 52° | — | — |
| 1982 | 64° | 45° | 54° | — | — |
| 1981 | 61° | 46° | 53° | — | — |
| 1980 | 63° | 49° | 56° | 0.03" | — |
| 1979 | 60° | 49° | 54° | 0.03" | — |
| 1978 | 83° | 47° | 65° | — | — |
| 1977 | 55° | 47° | 51° | — | — |
| 1976 | 65° | 38° | 51° | — | — |
| 1975 | 63° | 42° | 52° | — | — |
| 1974 | 69° | 44° | 57° | 1.04" | — |
| 1973 | 70° | 50° | 60° | — | — |
| 1972 | 59° | 48° | 54° | — | — |
| 1971 | 64° | 44° | 54° | 0.38" | — |
56 years of data from BURLINGAME