Weather on July 21
San Mateo, CA
55 Years of Data
Avg High
71°F
Avg Low
56°F
Warmest
2006
72°F avg
Coldest
2000
59°F avg
About This Date
July 21st in San Mateo, CA typically brings pleasant summer weather, with average highs around 71°F and lows near 56°F. Over 55 years of records, the warmest July 21st was in 2006 (72°F average), while the coldest was 2000 (59°F) — a 13°F range across recorded history. Rain or other precipitation has occurred on about 2% of July 21st dates historically. 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 21st in San Mateo, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 66° | 58° | 62° | — | — |
| 2024 | 64° | 55° | 60° | — | — |
| 2023 | 73° | 56° | 64° | — | — |
| 2022 | 65° | 53° | 59° | — | — |
| 2021 | 68° | 55° | 62° | — | — |
| 2020 | 71° | 55° | 63° | — | — |
| 2019 | 73° | 58° | 65° | — | — |
| 2018 | 75° | 59° | 67° | — | — |
| 2017 | 70° | 55° | 62° | — | — |
| 2016 | 70° | 56° | 63° | — | — |
| 2015 | 70° | 60° | 65° | — | — |
| 2014 | 76° | 65° | 70° | — | — |
| 2013 | 68° | 54° | 61° | — | — |
| 2012 | 82° | 56° | 69° | — | — |
| 2011 | 74° | 54° | 64° | — | — |
| 2010 | 65° | 53° | 59° | — | — |
| 2009 | 64° | 54° | 59° | — | — |
| 2008 | 64° | 53° | 59° | — | — |
| 2007 | 75° | 61° | 68° | — | — |
| 2006warmest | 83° | 61° | 72° | — | — |
| 2005 | 73° | 58° | 65° | — | — |
| 2004 | 76° | 58° | 67° | — | — |
| 2003 | 72° | 58° | 65° | — | — |
| 2002 | 72° | 58° | 65° | — | — |
| 2001 | 65° | 55° | 60° | — | — |
| 2000coldest | 65° | 54° | 59° | — | — |
| 1999 | 68° | 55° | 62° | — | — |
| 1998 | 66° | 55° | 61° | — | — |
| 1997 | 71° | 57° | 64° | — | — |
| 1996 | 74° | 54° | 64° | — | — |
| 1995 | 70° | 59° | 64° | — | — |
| 1994 | 70° | 58° | 64° | — | — |
| 1993 | 72° | 55° | 63° | — | — |
| 1992 | 71° | 60° | 66° | — | — |
| 1991 | 70° | 57° | 63° | — | — |
| 1990 | 70° | 57° | 63° | — | — |
| 1989 | 75° | 53° | 64° | — | — |
| 1988 | 71° | 57° | 64° | — | — |
| 1987 | 72° | 57° | 64° | — | — |
| 1986 | 72° | 53° | 62° | — | — |
| 1985 | 70° | 55° | 62° | — | — |
| 1984 | 68° | 55° | 62° | — | — |
| 1983 | 71° | 51° | 61° | — | — |
| 1982 | 70° | 54° | 62° | — | — |
| 1981 | 69° | 50° | 60° | — | — |
| 1980 | 70° | 55° | 62° | — | — |
| 1979 | 70° | 57° | 63° | 0.23" | — |
| 1978 | 80° | 50° | 65° | — | — |
| 1977 | 76° | 50° | 63° | — | — |
| 1976 | 71° | 54° | 62° | — | — |
| 1975 | 78° | 63° | 70° | — | — |
| 1974 | 74° | 52° | 63° | — | — |
| 1973 | 78° | 56° | 67° | — | — |
| 1972 | 70° | 58° | 64° | — | — |
| 1971 | 70° | 57° | 63° | — | — |
55 years of data from BURLINGAME