Weather on August 9
San Mateo, CA
55 Years of Data
Avg High
74°F
Avg Low
56°F
Warmest
2002
78°F avg
Coldest
2024
58°F avg
About This Date
August 9th in San Mateo, CA typically brings pleasant summer weather, with average highs around 74°F and lows near 56°F. Over 55 years of records, the warmest August 9th was in 2002 (78°F average), while the coldest was 2024 (58°F) — a 20°F range across recorded history. This date has historically been dry, with little recorded precipitation. 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 August 9th in San Mateo, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 75° | 57° | 66° | — | — |
| 2024coldest | 65° | 51° | 58° | — | — |
| 2023 | 75° | 58° | 66° | — | — |
| 2022 | 75° | 63° | 69° | — | — |
| 2021 | 75° | 57° | 66° | — | — |
| 2020 | 73° | 58° | 65° | — | — |
| 2019 | 77° | 61° | 69° | — | — |
| 2018 | 79° | 52° | 65° | — | — |
| 2017 | 67° | 59° | 63° | — | — |
| 2016 | 76° | 57° | 66° | — | — |
| 2015 | 71° | 60° | 66° | — | — |
| 2014 | 70° | 59° | 64° | — | — |
| 2013 | 70° | 56° | 63° | — | — |
| 2012 | 72° | 54° | 63° | — | — |
| 2011 | 69° | 53° | 61° | — | — |
| 2010 | 69° | 55° | 62° | — | — |
| 2009 | 85° | 57° | 71° | — | — |
| 2008 | 68° | 56° | 62° | — | — |
| 2007 | 72° | 57° | 64° | — | — |
| 2006 | 88° | 60° | 74° | — | — |
| 2005 | 70° | 56° | 63° | — | — |
| 2004 | 70° | 58° | 64° | — | — |
| 2003 | 73° | 60° | 67° | — | — |
| 2002warmest | 94° | 62° | 78° | — | — |
| 2001 | 73° | 58° | 65° | — | — |
| 2000 | 69° | 58° | 63° | — | — |
| 1999 | 68° | 58° | 63° | — | — |
| 1998 | 69° | 53° | 61° | — | — |
| 1997 | 76° | 61° | 68° | — | — |
| 1996 | 78° | 52° | 65° | — | — |
| 1995 | 75° | 55° | 65° | — | — |
| 1994 | 73° | 54° | 63° | — | — |
| 1993 | 70° | 58° | 64° | — | — |
| 1992 | 85° | 54° | 69° | — | — |
| 1991 | 75° | 58° | 66° | — | — |
| 1990 | 75° | 58° | 66° | — | — |
| 1989 | 69° | 56° | 62° | — | — |
| 1988 | 71° | 54° | 62° | — | — |
| 1987 | 75° | 60° | 68° | — | — |
| 1986 | 66° | 53° | 60° | — | — |
| 1985 | 85° | 55° | 70° | — | — |
| 1984 | 77° | 52° | 64° | — | — |
| 1983 | 72° | 57° | 64° | — | — |
| 1982 | 66° | 56° | 61° | — | — |
| 1981 | 71° | 53° | 62° | — | — |
| 1980 | 68° | 52° | 60° | — | — |
| 1979 | 72° | 52° | 62° | — | — |
| 1978 | 83° | 58° | 70° | — | — |
| 1977 | 73° | 56° | 64° | — | — |
| 1976 | 76° | 50° | 63° | — | — |
| 1975 | 81° | — | — | — | — |
| 1974 | 74° | 56° | 65° | — | — |
| 1973 | 72° | 56° | 64° | — | — |
| 1972 | 81° | 58° | 69° | — | — |
| 1971 | 81° | 57° | 69° | — | — |
55 years of data from BURLINGAME