Weather on August 21
San Francisco, CA
55 Years of Data
Avg High
68°F
Avg Low
56°F
Warmest
1993
69°F avg
Coldest
1980
55°F avg
About This Date
August 21st in San Francisco, CA typically brings mild summer weather, with average highs around 68°F and lows near 56°F. Over 55 years of records, the warmest August 21st was in 1993 (69°F average), while the coldest was 1980 (55°F) — a 14°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 2.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.1°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in San Francisco, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 57° | 67° | — | — |
| 2024 | 67° | 57° | 62° | — | — |
| 2023 | 73° | 61° | 67° | — | — |
| 2022 | 70° | 55° | 62° | — | — |
| 2021 | 63° | 57° | 60° | — | — |
| 2020 | 75° | 58° | 66° | — | — |
| 2019 | 74° | 58° | 66° | — | — |
| 2018 | 64° | 55° | 60° | — | — |
| 2017 | 70° | 61° | 65° | — | — |
| 2016 | 64° | 57° | 61° | — | — |
| 2015 | 64° | 59° | 62° | — | — |
| 2014 | 69° | 59° | 64° | — | — |
| 2013 | 66° | 57° | 62° | — | — |
| 2012 | 61° | 52° | 56° | — | — |
| 2011 | 63° | 55° | 59° | — | — |
| 2010 | 61° | 53° | 57° | — | — |
| 2009 | 75° | 55° | 65° | — | — |
| 2008 | 68° | 59° | 64° | — | — |
| 2007 | 74° | 58° | 66° | — | — |
| 2006 | 62° | 53° | 58° | — | — |
| 2005 | 61° | 54° | 57° | — | — |
| 2004 | 68° | 58° | 63° | — | — |
| 2003 | 71° | 60° | 66° | — | — |
| 2002 | 61° | 52° | 56° | — | — |
| 2001 | 67° | 52° | 59° | — | — |
| 2000 | 68° | 53° | 61° | — | — |
| 1999 | 71° | 55° | 63° | — | — |
| 1998 | 63° | 54° | 58° | — | — |
| 1997 | 80° | 57° | 69° | — | — |
| 1996 | 70° | 57° | 63° | — | — |
| 1995 | 67° | 56° | 61° | — | — |
| 1994 | 67° | 55° | 61° | — | — |
| 1993warmest | 82° | 56° | 69° | — | — |
| 1992 | 69° | 54° | 61° | — | — |
| 1991 | 69° | 57° | 63° | — | — |
| 1990 | 71° | 59° | 65° | — | — |
| 1989 | 69° | 59° | 64° | — | — |
| 1988 | 68° | 58° | 63° | — | — |
| 1987 | 70° | 57° | 63° | — | — |
| 1986 | 62° | 55° | 59° | — | — |
| 1985 | 69° | 57° | 63° | — | — |
| 1984 | 66° | 54° | 60° | — | — |
| 1983 | 74° | 60° | 67° | — | — |
| 1982 | 68° | 52° | 60° | — | — |
| 1981 | 68° | 53° | 61° | — | — |
| 1980coldest | 59° | 52° | 55° | — | — |
| 1979 | 68° | 60° | 64° | — | — |
| 1978 | 61° | 55° | 58° | — | — |
| 1977 | 67° | 54° | 60° | — | — |
| 1976 | 71° | 60° | 66° | — | — |
| 1975 | 65° | 53° | 59° | — | — |
| 1974 | 77° | 54° | 65° | — | — |
| 1973 | 60° | 51° | 56° | — | — |
| 1972 | 71° | 59° | 65° | — | — |
| 1971 | 67° | 58° | 62° | — | — |
55 years of data from SAN FRANCISCO DWTN