Weather on August 21
Fairfield, CA
55 Years of Data
Avg High
86°F
Avg Low
57°F
Warmest
1995
80°F avg
Coldest
1979
62°F avg
About This Date
August 21st in Fairfield, CA typically brings warm summer weather, with average highs around 86°F and lows near 57°F — a 29°F daily swing. Over 55 years of records, the warmest August 21st was in 1995 (80°F average), while the coldest was 1979 (62°F) — a 18°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Fairfield, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 102° | — | — | — | — |
| 2024 | 87° | 60° | 74° | — | — |
| 2023 | 90° | 64° | 77° | — | — |
| 2022 | 92° | 62° | 77° | — | — |
| 2021 | 72° | 59° | 65° | — | — |
| 2020 | 99° | 61° | 80° | — | — |
| 2019 | 93° | 60° | 77° | — | — |
| 2018 | 73° | 54° | 63° | — | — |
| 2017 | 79° | 62° | 70° | — | — |
| 2016 | 84° | 57° | 71° | — | — |
| 2015 | 83° | 58° | 70° | — | — |
| 2014 | 87° | 56° | 71° | — | — |
| 2013 | 87° | 58° | 72° | — | — |
| 2012 | 88° | 55° | 71° | — | — |
| 2011 | 80° | 50° | 65° | — | — |
| 2010 | 85° | 53° | 69° | — | — |
| 2009 | 82° | 57° | 70° | — | — |
| 2008 | 86° | 62° | 74° | — | — |
| 2007 | 92° | 62° | 77° | — | — |
| 2006 | 84° | 55° | 70° | — | — |
| 2005 | 83° | 54° | 68° | — | — |
| 2004 | 84° | 59° | 72° | — | — |
| 2003 | 83° | 62° | 72° | — | — |
| 2002 | 82° | 59° | 71° | — | — |
| 2001 | 82° | 54° | 68° | — | — |
| 2000 | 88° | 56° | 72° | — | — |
| 1999 | 97° | 56° | 76° | — | — |
| 1998 | 82° | 54° | 68° | — | — |
| 1997 | 80° | 59° | 70° | — | — |
| 1996 | 86° | 59° | 73° | — | — |
| 1995warmest | 99° | 62° | 80° | — | — |
| 1994 | 83° | 56° | 69° | — | — |
| 1993 | 94° | 61° | 77° | — | — |
| 1992 | 83° | 60° | 71° | — | — |
| 1991 | 85° | 55° | 70° | — | — |
| 1990 | 85° | 56° | 70° | — | — |
| 1989 | 76° | 55° | 65° | — | — |
| 1988 | 80° | 59° | 70° | — | — |
| 1987 | 79° | 54° | 66° | — | — |
| 1986 | 93° | 53° | 73° | — | — |
| 1985 | 90° | 50° | 70° | — | — |
| 1984 | 90° | 51° | 70° | — | — |
| 1983 | — | 58° | — | — | — |
| 1982 | 100° | 57° | 79° | — | — |
| 1981 | 90° | 55° | 72° | — | — |
| 1980 | 89° | 50° | 70° | — | — |
| 1979coldest | 80° | 44° | 62° | — | — |
| 1978 | 84° | 57° | 71° | — | — |
| 1977 | 80° | 57° | 69° | — | — |
| 1976 | 88° | 60° | 74° | — | — |
| 1975 | 87° | 56° | 71° | — | — |
| 1974 | 90° | 56° | 73° | — | — |
| 1973 | 89° | 53° | 71° | — | — |
| 1972 | 95° | 59° | 77° | — | — |
| 1971 | 83° | 59° | 71° | — | — |
55 years of data from FAIRFIELD