Weather on August 15
San Mateo, CA
55 Years of Data
Avg High
74°F
Avg Low
56°F
Warmest
2020
80°F avg
Coldest
1973
60°F avg
About This Date
August 15th 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 15th was in 2020 (80°F average), while the coldest was 1973 (60°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 15th dates historically, with the wettest August 15th recording 0.69" 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 August 15th in San Mateo, CA? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 71° | 58° | 64° | — | — |
| 2024 | 68° | 53° | 61° | — | — |
| 2023 | 80° | 59° | 70° | — | — |
| 2022 | 76° | 57° | 66° | — | — |
| 2021 | 71° | 58° | 64° | — | — |
| 2020warmest | 94° | 66° | 80° | — | — |
| 2019 | 94° | 61° | 77° | — | — |
| 2018 | 71° | 59° | 65° | — | — |
| 2017 | 73° | 59° | 66° | — | — |
| 2016 | 70° | 55° | 62° | — | — |
| 2015 | 92° | 60° | 76° | — | — |
| 2014 | 74° | 60° | 67° | — | — |
| 2013 | 77° | 62° | 70° | — | — |
| 2012 | 69° | 57° | 63° | — | — |
| 2011 | 71° | 56° | 63° | — | — |
| 2010 | 66° | 56° | 61° | — | — |
| 2009 | 79° | 55° | 67° | — | — |
| 2008 | 72° | 54° | 63° | — | — |
| 2007 | 70° | 55° | 62° | — | — |
| 2006 | 72° | 56° | 64° | — | — |
| 2005 | 72° | 58° | 65° | — | — |
| 2004 | 72° | 59° | 65° | — | — |
| 2003 | 72° | 57° | 64° | — | — |
| 2002 | 69° | 58° | 63° | — | — |
| 2001 | 66° | 55° | 61° | — | — |
| 2000 | 74° | 54° | 64° | — | — |
| 1999 | 73° | 55° | 64° | — | — |
| 1998 | 71° | 56° | 63° | — | — |
| 1997 | 71° | 58° | 64° | — | — |
| 1996 | 74° | 51° | 62° | — | — |
| 1995 | 73° | 54° | 63° | — | — |
| 1994 | 84° | 54° | 69° | — | — |
| 1993 | 73° | 58° | 65° | — | — |
| 1992 | 75° | 58° | 66° | — | — |
| 1991 | 69° | 59° | 64° | — | — |
| 1990 | 67° | 59° | 63° | — | — |
| 1989 | 76° | 54° | 65° | — | — |
| 1988 | 67° | 56° | 61° | — | — |
| 1987 | 76° | 56° | 66° | — | — |
| 1986 | 70° | 56° | 63° | — | — |
| 1985 | 66° | 56° | 61° | — | — |
| 1984 | 69° | 54° | 61° | — | — |
| 1983 | 86° | 58° | 72° | — | — |
| 1982 | 71° | 53° | 62° | — | — |
| 1981 | 70° | 54° | 62° | — | — |
| 1980 | 73° | 50° | 62° | — | — |
| 1979 | 70° | 55° | 62° | — | — |
| 1978 | 87° | 54° | 70° | — | — |
| 1977 | 71° | 53° | 62° | — | — |
| 1976 | 72° | 56° | 64° | 0.69" | — |
| 1975 | 71° | 53° | 62° | — | — |
| 1974 | 72° | 50° | 61° | — | — |
| 1973coldest | 70° | 51° | 60° | — | — |
| 1972 | 71° | 56° | 63° | — | — |
| 1971 | 74° | 54° | 64° | — | — |
55 years of data from BURLINGAME