Weather on July 31
San Mateo, CA
55 Years of Data
Avg High
73°F
Avg Low
56°F
Warmest
1993
79°F avg
Coldest
2018
58°F avg
About This Date
July 31st in San Mateo, CA typically brings pleasant summer weather, with average highs around 73°F and lows near 56°F. Over 55 years of records, the warmest July 31st was in 1993 (79°F average), while the coldest was 2018 (58°F) — a 21°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 July 31st in San Mateo, CA? Great weather for outdoor activities.
Cooling Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 72° | 59° | 65° | — | — |
| 2024 | 68° | 55° | 62° | — | — |
| 2023 | 70° | 57° | 63° | — | — |
| 2022 | 72° | 60° | 66° | — | — |
| 2021 | 75° | 58° | 66° | — | — |
| 2020 | 68° | 55° | 62° | — | — |
| 2019 | 75° | 55° | 65° | — | — |
| 2018coldest | 65° | 52° | 58° | — | — |
| 2017 | 69° | 55° | 62° | — | — |
| 2016 | 76° | 56° | 66° | — | — |
| 2015 | 73° | 60° | 67° | — | — |
| 2014 | 72° | 58° | 65° | — | — |
| 2013 | 70° | 54° | 62° | — | — |
| 2012 | 68° | 55° | 62° | — | — |
| 2011 | 71° | 58° | 64° | — | — |
| 2010 | 68° | 56° | 62° | — | — |
| 2009 | 68° | 56° | 62° | — | — |
| 2008 | 66° | 55° | 61° | — | — |
| 2007 | 70° | 55° | 62° | — | — |
| 2006 | 69° | 57° | 63° | — | — |
| 2005 | 71° | 55° | 63° | — | — |
| 2004 | 65° | 58° | 61° | — | — |
| 2003 | 72° | 57° | 64° | — | — |
| 2002 | 73° | 57° | 65° | — | — |
| 2001 | 72° | 56° | 64° | — | — |
| 2000 | 79° | 54° | 66° | — | — |
| 1999 | 64° | 54° | 59° | — | — |
| 1998 | 75° | 59° | 67° | — | — |
| 1997 | 68° | 58° | 63° | — | — |
| 1996 | 72° | 55° | 63° | — | — |
| 1995 | 82° | 60° | 71° | — | — |
| 1994 | 70° | 56° | 63° | — | — |
| 1993warmest | 97° | 61° | 79° | — | — |
| 1992 | 68° | 57° | 63° | — | — |
| 1991 | 75° | 57° | 66° | — | — |
| 1990 | 72° | 56° | 64° | — | — |
| 1989 | 70° | 55° | 62° | — | — |
| 1988 | 76° | 60° | 68° | — | — |
| 1987 | 83° | 52° | 67° | — | — |
| 1986 | 71° | 54° | 62° | — | — |
| 1985 | 72° | 58° | 65° | — | — |
| 1984 | 69° | 53° | 61° | — | — |
| 1983 | 75° | 58° | 66° | — | — |
| 1982 | 70° | 52° | 61° | — | — |
| 1981 | 68° | 52° | 60° | — | — |
| 1980 | 85° | 59° | 72° | — | — |
| 1979 | 72° | 52° | 62° | — | — |
| 1978 | 85° | 52° | 68° | — | — |
| 1977 | 73° | 59° | 66° | — | — |
| 1976 | 76° | 53° | 64° | — | — |
| 1975 | 84° | — | — | — | — |
| 1974 | 71° | 55° | 63° | — | — |
| 1973 | 81° | 53° | 67° | — | — |
| 1972 | 70° | 57° | 63° | — | — |
| 1971 | 69° | 54° | 61° | — | — |
55 years of data from BURLINGAME