Weather on June 21
San Mateo, CA
55 Years of Data
Avg High
73°F
Avg Low
53°F
Warmest
2022
79°F avg
Coldest
2002
55°F avg
About This Date
June 21st in San Mateo, CA typically brings pleasant summer weather, with average highs around 73°F and lows near 53°F. Over 55 years of records, the warmest June 21st was in 2022 (79°F average), while the coldest was 2002 (55°F) — a 24°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 3.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.9°F warmer on this date compared to 20-30 years ago.
Planning for June 21st in San Mateo, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 68° | 52° | 60° | — | — |
| 2024 | 66° | 51° | 59° | — | — |
| 2023 | 68° | 53° | 61° | — | — |
| 2022warmest | 98° | 61° | 79° | — | — |
| 2021 | 75° | 60° | 68° | — | — |
| 2020 | 69° | 55° | 62° | — | — |
| 2019 | 72° | 55° | 63° | — | — |
| 2018 | 69° | 54° | 61° | — | — |
| 2017 | 76° | 54° | 65° | — | — |
| 2016 | 78° | 55° | 67° | — | — |
| 2015 | 66° | 55° | 61° | — | — |
| 2014 | 66° | 56° | 61° | — | — |
| 2013 | 71° | 51° | 61° | — | — |
| 2012 | 60° | 52° | 56° | — | — |
| 2011 | 86° | 54° | 70° | — | — |
| 2010 | 71° | 53° | 62° | — | — |
| 2009 | 68° | 53° | 61° | — | — |
| 2008 | 91° | 53° | 72° | — | — |
| 2007 | 72° | 53° | 62° | — | — |
| 2006 | 88° | 56° | 72° | — | — |
| 2005 | 70° | 57° | 63° | — | — |
| 2004 | 65° | 54° | 59° | — | — |
| 2003 | 65° | 52° | 58° | — | — |
| 2002coldest | 58° | 52° | 55° | — | — |
| 2001 | 82° | 56° | 69° | — | — |
| 2000 | 73° | 55° | 64° | — | — |
| 1999 | 65° | 53° | 59° | — | — |
| 1998 | 69° | 55° | 62° | — | — |
| 1997 | 68° | 54° | 61° | — | — |
| 1996 | 61° | 52° | 56° | — | — |
| 1995 | 80° | 51° | 66° | — | — |
| 1994 | 68° | 52° | 60° | — | — |
| 1993 | 67° | 54° | 60° | — | — |
| 1992 | 80° | 57° | 69° | — | — |
| 1991 | 62° | 51° | 57° | — | — |
| 1990 | 76° | 57° | 66° | — | — |
| 1989 | 93° | 54° | 73° | — | — |
| 1988 | 74° | 57° | 65° | — | — |
| 1987 | 67° | 54° | 60° | — | — |
| 1986 | 82° | 51° | 67° | — | — |
| 1985 | 75° | 56° | 65° | — | — |
| 1984 | 78° | 49° | 63° | — | — |
| 1983 | 70° | 49° | 59° | — | — |
| 1982 | 68° | 54° | 61° | — | — |
| 1981 | 92° | 56° | 74° | — | — |
| 1980 | 66° | 51° | 59° | — | — |
| 1979 | 63° | 52° | 57° | — | — |
| 1978 | 72° | 56° | 64° | — | — |
| 1977 | 86° | 46° | 66° | — | — |
| 1976 | 69° | 54° | 61° | — | — |
| 1975 | 63° | 51° | 57° | — | — |
| 1974 | 76° | 47° | 61° | — | — |
| 1973 | 98° | 52° | 75° | — | — |
| 1972 | 72° | 53° | 62° | — | — |
| 1971 | 79° | 52° | 65° | — | — |
55 years of data from BURLINGAME