Weather on September 5
San Mateo, CA
55 Years of Data
Avg High
76°F
Avg Low
56°F
Warmest
2022
80°F avg
Coldest
1973
59°F avg
About This Date
September 5th in San Mateo, CA typically brings pleasant fall weather, with average highs around 76°F and lows near 56°F. Over 55 years of records, the warmest September 5th was in 2022 (80°F average), while the coldest was 1973 (59°F) — a 21°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for September 5th in San Mateo, CA? Great weather for outdoor activities.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 70° | 60° | 65° | — | — |
| 2024 | 76° | 53° | 64° | — | — |
| 2023 | 75° | 58° | 66° | — | — |
| 2022warmest | 97° | 64° | 80° | — | — |
| 2021 | 78° | 53° | 66° | — | — |
| 2020 | 93° | 58° | 75° | — | — |
| 2019 | 73° | 58° | 65° | — | — |
| 2018 | 71° | 55° | 63° | — | — |
| 2017 | 83° | 60° | 71° | — | — |
| 2016 | 72° | 53° | 62° | — | — |
| 2015 | 77° | 53° | 65° | — | — |
| 2014 | 75° | 60° | 68° | — | — |
| 2013 | 72° | 60° | 66° | — | — |
| 2012 | 65° | 54° | 59° | — | — |
| 2011 | 65° | 53° | 59° | — | — |
| 2010 | 77° | 56° | 66° | — | — |
| 2009 | 75° | 58° | 66° | — | — |
| 2008 | 93° | 61° | 77° | — | — |
| 2007 | 88° | 57° | 72° | — | — |
| 2006 | 71° | 53° | 62° | — | — |
| 2005 | 73° | 55° | 64° | — | — |
| 2004 | 94° | 63° | 78° | — | — |
| 2003 | 72° | 58° | 65° | — | — |
| 2002 | 70° | 57° | 63° | — | — |
| 2001 | 68° | 56° | 62° | — | — |
| 2000 | 76° | 51° | 63° | — | — |
| 1999 | 76° | 50° | 63° | — | — |
| 1998 | 79° | 61° | 70° | — | — |
| 1997 | 75° | 61° | 68° | — | — |
| 1996 | 75° | 53° | 64° | — | — |
| 1995 | 81° | 52° | 66° | — | — |
| 1994 | 73° | 54° | 63° | — | — |
| 1993 | 67° | 57° | 62° | — | — |
| 1992 | 82° | 55° | 69° | — | — |
| 1991 | 69° | 56° | 62° | — | — |
| 1990 | 77° | 56° | 66° | — | — |
| 1989 | 68° | 50° | 59° | — | — |
| 1988 | 72° | 53° | 62° | — | — |
| 1987 | 72° | 58° | 65° | — | — |
| 1986 | 70° | 54° | 62° | — | — |
| 1985 | 73° | 60° | 67° | — | — |
| 1984 | 72° | 57° | 64° | — | — |
| 1983 | 85° | 60° | 72° | — | — |
| 1982 | 82° | 54° | 68° | — | — |
| 1981 | 82° | 52° | 67° | — | — |
| 1980 | 68° | 53° | 61° | — | — |
| 1979 | 74° | 57° | 65° | — | — |
| 1978 | 83° | 57° | 70° | — | — |
| 1977 | 80° | 54° | 67° | — | — |
| 1976 | 68° | 52° | 60° | — | — |
| 1975 | 84° | 52° | 68° | — | — |
| 1974 | 82° | 52° | 67° | — | — |
| 1973coldest | 69° | 49° | 59° | — | — |
| 1972 | 72° | 52° | 62° | — | — |
| 1971 | 78° | 53° | 66° | — | — |
55 years of data from BURLINGAME