Weather on August 31
Fairfield, CA
55 Years of Data
Avg High
89°F
Avg Low
57°F
Warmest
2007
85°F avg
Coldest
2000
62°F avg
About This Date
August 31st in Fairfield, CA typically brings warm summer weather, with average highs around 89°F and lows near 57°F — a 32°F daily swing. Over 55 years of records, the warmest August 31st was in 2007 (85°F average), while the coldest was 2000 (62°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 31st dates historically. The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
Planning for August 31st in Fairfield, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 100° | 65° | 82° | — | — |
| 2024 | 90° | 59° | 74° | — | — |
| 2023 | 92° | 61° | 76° | — | — |
| 2022 | 95° | 54° | 74° | — | — |
| 2021 | 87° | 59° | 73° | — | — |
| 2020 | 89° | 56° | 72° | — | — |
| 2019 | 96° | 61° | 78° | — | — |
| 2018 | 86° | 55° | 71° | — | — |
| 2017 | 102° | 57° | 80° | — | — |
| 2016 | 85° | 58° | 71° | — | — |
| 2015 | 90° | 60° | 75° | — | — |
| 2014 | 92° | 60° | 76° | — | — |
| 2013 | — | 66° | — | — | — |
| 2012 | 89° | 56° | 72° | — | — |
| 2011 | 82° | 55° | 69° | — | — |
| 2010 | 79° | 53° | 66° | — | — |
| 2009 | 83° | 54° | 68° | — | — |
| 2008 | 88° | 54° | 71° | — | — |
| 2007warmest | 103° | 68° | 85° | — | — |
| 2006 | 93° | 57° | 75° | — | — |
| 2005 | 97° | 60° | 78° | — | — |
| 2004 | 93° | 57° | 75° | — | — |
| 2003 | 92° | 53° | 72° | — | — |
| 2002 | 96° | 54° | 75° | — | — |
| 2001 | 88° | 58° | 73° | — | — |
| 2000coldest | 66° | 57° | 62° | — | — |
| 1999 | 83° | 61° | 72° | — | — |
| 1998 | 100° | 56° | 78° | — | — |
| 1997 | 82° | 58° | 70° | — | — |
| 1996 | 100° | 60° | 80° | — | — |
| 1995 | 91° | 54° | 72° | — | — |
| 1994 | 87° | 57° | 72° | — | — |
| 1993 | 83° | 57° | 70° | — | — |
| 1992 | 82° | 55° | 69° | — | — |
| 1991 | 85° | 56° | 70° | — | — |
| 1990 | 87° | 59° | 73° | — | — |
| 1989 | 90° | 55° | 72° | — | — |
| 1988 | 94° | 57° | 75° | — | — |
| 1987 | 87° | 61° | 74° | — | — |
| 1986 | 95° | 52° | 73° | — | — |
| 1985 | 97° | 50° | 73° | — | — |
| 1984 | 75° | 53° | 64° | 0.43" | — |
| 1983 | 88° | 59° | 73° | — | — |
| 1982 | 93° | 53° | 73° | — | — |
| 1981 | 94° | 57° | 75° | — | — |
| 1980 | 86° | 52° | 69° | — | — |
| 1979 | 83° | 58° | 70° | — | — |
| 1978 | 81° | 55° | 68° | — | — |
| 1977 | 94° | 59° | 76° | — | — |
| 1976 | 101° | 58° | 79° | — | — |
| 1975 | 82° | 56° | 69° | — | — |
| 1974 | 75° | 56° | 65° | — | — |
| 1973 | 79° | 55° | 67° | — | — |
| 1972 | 93° | 59° | 76° | — | — |
| 1971 | 83° | 55° | 69° | — | — |
55 years of data from FAIRFIELD