Weather on August 31
Vacaville, CA
55 Years of Data
Avg High
93°F
Avg Low
56°F
Warmest
2007
87°F avg
Coldest
2012
65°F avg
About This Date
August 31st in Vacaville, CA typically brings hot summer weather, with average highs around 93°F and lows near 56°F — a 37°F daily swing. Over 55 years of records, the warmest August 31st was in 2007 (87°F average), while the coldest was 2012 (65°F) — a 22°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
Planning for August 31st in Vacaville, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 103° | 59° | 81° | — | — |
| 2024 | 96° | 59° | 78° | — | — |
| 2023 | 92° | 55° | 73° | — | — |
| 2022 | 98° | 60° | 79° | — | — |
| 2021 | 92° | 61° | 76° | — | — |
| 2020 | 95° | 57° | 76° | — | — |
| 2019 | 99° | 58° | 78° | — | — |
| 2018 | 89° | 54° | 71° | — | — |
| 2017 | 103° | 58° | 80° | — | — |
| 2016 | 90° | 61° | 75° | — | — |
| 2015 | 93° | 58° | 75° | — | — |
| 2014 | 93° | 60° | 77° | — | — |
| 2013 | 94° | 59° | 76° | — | — |
| 2012coldest | 75° | 56° | 65° | — | — |
| 2011 | 87° | 56° | 71° | — | — |
| 2010 | 92° | 54° | 73° | — | — |
| 2009 | 89° | 61° | 75° | — | — |
| 2008 | 84° | 59° | 72° | — | — |
| 2007warmest | 102° | 72° | 87° | — | — |
| 2006 | 97° | 60° | 78° | — | — |
| 2005 | 100° | 61° | 80° | — | — |
| 2004 | 95° | 59° | 77° | — | — |
| 2003 | 99° | 56° | 77° | — | — |
| 2002 | 98° | 54° | 76° | — | — |
| 2001 | 90° | 55° | 72° | — | — |
| 2000 | 80° | 57° | 69° | — | — |
| 1999 | 84° | 62° | 73° | — | — |
| 1998 | 100° | 56° | 78° | — | — |
| 1997 | 91° | 57° | 74° | — | — |
| 1996 | 105° | 57° | 81° | — | — |
| 1995 | 94° | 53° | 73° | — | — |
| 1994 | 95° | 53° | 74° | — | — |
| 1993 | 84° | 54° | 69° | — | — |
| 1992 | 88° | 52° | 70° | — | — |
| 1991 | 93° | 49° | 71° | — | — |
| 1990 | 92° | 58° | 75° | — | — |
| 1989 | 92° | 54° | 73° | — | — |
| 1988 | 102° | 60° | 81° | — | — |
| 1987 | 96° | 62° | 79° | — | — |
| 1986 | 90° | 54° | 72° | — | — |
| 1985 | 95° | 51° | 73° | — | — |
| 1984 | 89° | 52° | 70° | — | — |
| 1983 | 80° | 62° | 71° | — | — |
| 1982 | 89° | 49° | 69° | — | — |
| 1981 | 96° | 54° | 75° | — | — |
| 1980 | 88° | 51° | 69° | — | — |
| 1979 | 89° | 53° | 71° | — | — |
| 1978 | 90° | 56° | 73° | — | — |
| 1977 | 95° | 59° | 77° | — | — |
| 1976 | 105° | 55° | 80° | — | — |
| 1975 | 86° | 48° | 67° | — | — |
| 1974 | 87° | 52° | 69° | — | — |
| 1973 | 84° | 56° | 70° | — | — |
| 1972 | 100° | 55° | 78° | — | — |
| 1971 | 85° | 53° | 69° | — | — |
55 years of data from VACAVILLE/NUT TREE AP ASOS