Weather on July 20
San Mateo, CA
55 Years of Data
Avg High
72°F
Avg Low
56°F
Warmest
1996
74°F avg
Coldest
2008
58°F avg
About This Date
July 20th in San Mateo, CA typically brings pleasant summer weather, with average highs around 72°F and lows near 56°F. Over 55 years of records, the warmest July 20th was in 1996 (74°F average), while the coldest was 2008 (58°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 2% of July 20th dates historically. The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
Planning for July 20th in San Mateo, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 68° | 55° | 62° | — | — |
| 2024 | 68° | 56° | 62° | — | — |
| 2023 | 73° | 55° | 64° | — | — |
| 2022 | 67° | 54° | 60° | — | — |
| 2021 | 66° | 55° | 61° | — | — |
| 2020 | 69° | 55° | 62° | — | — |
| 2019 | 74° | 58° | 66° | — | — |
| 2018 | 83° | 56° | 69° | — | — |
| 2017 | 68° | 56° | 62° | — | — |
| 2016 | 68° | 56° | 62° | — | — |
| 2015 | 76° | 60° | 68° | — | — |
| 2014 | 78° | 58° | 68° | — | — |
| 2013 | 70° | 54° | 62° | — | — |
| 2012 | 71° | 57° | 64° | — | — |
| 2011 | 80° | 56° | 68° | — | — |
| 2010 | 69° | 55° | 62° | — | — |
| 2009 | 66° | 55° | 61° | — | — |
| 2008coldest | 64° | 52° | 58° | — | — |
| 2007 | 73° | 59° | 66° | — | — |
| 2006 | 80° | 60° | 70° | — | — |
| 2005 | 71° | 58° | 64° | — | — |
| 2004 | 70° | 59° | 64° | — | — |
| 2003 | 84° | 58° | 71° | — | — |
| 2002 | 74° | 55° | 64° | — | — |
| 2001 | 64° | 56° | 60° | — | — |
| 2000 | 66° | 54° | 60° | — | — |
| 1999 | 67° | 57° | 62° | — | — |
| 1998 | 72° | 55° | 63° | — | — |
| 1997 | 69° | 56° | 62° | — | — |
| 1996warmest | 93° | 55° | 74° | — | — |
| 1995 | 68° | 58° | 63° | — | — |
| 1994 | 69° | 57° | 63° | — | — |
| 1993 | 69° | 55° | 62° | — | — |
| 1992 | 72° | 60° | 66° | — | — |
| 1991 | 72° | 57° | 64° | — | — |
| 1990 | 71° | 57° | 64° | — | — |
| 1989 | 71° | 55° | 63° | — | — |
| 1988 | 78° | 58° | 68° | — | — |
| 1987 | 69° | 55° | 62° | — | — |
| 1986 | 75° | 51° | 63° | — | — |
| 1985 | 68° | 56° | 62° | 0.08" | — |
| 1984 | 72° | 58° | 65° | — | — |
| 1983 | 76° | 55° | 65° | — | — |
| 1982 | 66° | 53° | 60° | — | — |
| 1981 | 72° | 49° | 60° | — | — |
| 1980 | 77° | 56° | 66° | — | — |
| 1979 | 79° | 54° | 66° | — | — |
| 1978 | 80° | 50° | 65° | — | — |
| 1977 | 78° | 52° | 65° | — | — |
| 1976 | 71° | 55° | 63° | — | — |
| 1975 | 71° | 62° | 67° | — | — |
| 1974 | 74° | 52° | 63° | — | — |
| 1973 | 67° | 58° | 62° | — | — |
| 1972 | 68° | 53° | 61° | — | — |
| 1971 | 73° | 52° | 62° | — | — |
55 years of data from BURLINGAME