Weather on August 20
Fairfield, CA
55 Years of Data
Avg High
87°F
Avg Low
57°F
Warmest
1995
80°F avg
Coldest
1989
64°F avg
About This Date
August 20th in Fairfield, CA typically brings warm summer weather, with average highs around 87°F and lows near 57°F — a 30°F daily swing. Over 55 years of records, the warmest August 20th was in 1995 (80°F average), while the coldest was 1989 (64°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 20th dates historically, with the wettest August 20th recording 1.04" of rain. The last decade has been 4.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.3°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Fairfield, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 99° | — | — | — | — |
| 2024 | 94° | 60° | 77° | — | — |
| 2023 | 94° | 63° | 78° | — | — |
| 2022 | 100° | 58° | 79° | — | — |
| 2021 | 83° | 55° | 69° | — | — |
| 2020 | 96° | 61° | 78° | — | — |
| 2019 | 84° | 57° | 71° | — | — |
| 2018 | — | 57° | — | — | — |
| 2017 | 84° | 58° | 71° | — | — |
| 2016 | 87° | 57° | 72° | — | — |
| 2015 | 83° | 58° | 70° | — | — |
| 2014 | 79° | 61° | 70° | — | — |
| 2013 | 94° | 64° | 79° | — | — |
| 2012 | 92° | 55° | 73° | — | — |
| 2011 | 75° | 60° | 68° | — | — |
| 2010 | 91° | 53° | 72° | — | — |
| 2009 | 85° | 57° | 71° | — | — |
| 2008 | 80° | 58° | 69° | — | — |
| 2007 | 86° | 56° | 71° | — | — |
| 2006 | 87° | 55° | 71° | — | — |
| 2005 | 87° | 51° | 69° | — | — |
| 2004 | 85° | 57° | 71° | — | — |
| 2003 | 92° | 56° | 74° | — | — |
| 2002 | 95° | 56° | 75° | — | — |
| 2001 | 75° | 55° | 65° | — | — |
| 2000 | 84° | 54° | 69° | — | — |
| 1999 | 92° | 54° | 73° | — | — |
| 1998 | 82° | 57° | 70° | — | — |
| 1997 | 82° | 60° | 71° | 1.04" | — |
| 1996 | 74° | 54° | 64° | — | — |
| 1995warmest | 99° | 62° | 80° | — | — |
| 1994 | 95° | 56° | 75° | — | — |
| 1993 | 84° | 58° | 71° | — | — |
| 1992 | 93° | 60° | 77° | — | — |
| 1991 | 84° | 55° | 70° | — | — |
| 1990 | 80° | 59° | 70° | — | — |
| 1989coldest | 75° | 54° | 64° | — | — |
| 1988 | 84° | 56° | 70° | — | — |
| 1987 | 78° | 54° | 66° | — | — |
| 1986 | 104° | 52° | 78° | — | — |
| 1985 | 88° | 43° | 65° | — | — |
| 1984 | 89° | 53° | 71° | — | — |
| 1983 | — | 60° | — | — | — |
| 1982 | 83° | 56° | 69° | — | — |
| 1981 | 83° | 53° | 68° | — | — |
| 1980 | 85° | 55° | 70° | — | — |
| 1979 | 89° | 58° | 73° | — | — |
| 1978 | 93° | 58° | 75° | — | — |
| 1977 | 83° | 57° | 70° | — | — |
| 1976 | 82° | 58° | 70° | — | — |
| 1975 | 80° | 57° | 69° | — | — |
| 1974 | 85° | 54° | 69° | — | — |
| 1973 | 87° | 54° | 70° | — | — |
| 1972 | 86° | 60° | 73° | — | — |
| 1971 | 84° | 55° | 70° | — | — |
55 years of data from FAIRFIELD