Weather on July 31
Vacaville, CA
55 Years of Data
Avg High
95°F
Avg Low
59°F
Warmest
1996
87°F avg
Coldest
1981
67°F avg
About This Date
July 31st in Vacaville, CA typically brings hot summer weather, with average highs around 95°F and lows near 59°F — a 36°F daily swing. Over 55 years of records, the warmest July 31st was in 1996 (87°F average), while the coldest was 1981 (67°F) — a 20°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
Planning for July 31st in Vacaville, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 95° | 58° | 76° | — | — |
| 2024 | 97° | 60° | 78° | — | — |
| 2023 | 96° | 57° | 77° | — | — |
| 2022 | 88° | 64° | 76° | — | — |
| 2021 | 98° | 65° | 81° | — | — |
| 2020 | 100° | 57° | 79° | — | — |
| 2019 | 94° | 55° | 74° | — | — |
| 2018 | 98° | 60° | 79° | — | — |
| 2017 | 103° | 62° | 82° | — | — |
| 2016 | 95° | 66° | 81° | — | — |
| 2015 | 96° | 65° | 80° | — | — |
| 2014 | 107° | 62° | 85° | — | — |
| 2013 | 91° | 56° | 73° | — | — |
| 2012 | 99° | 61° | 80° | — | — |
| 2011 | 88° | 59° | 73° | — | — |
| 2010 | 90° | 56° | 73° | — | — |
| 2009 | 95° | 59° | 77° | — | — |
| 2008 | 93° | 59° | 76° | — | — |
| 2007 | 99° | 62° | 80° | — | — |
| 2006 | 88° | 61° | 74° | — | — |
| 2005 | 101° | 61° | 81° | — | — |
| 2004 | 81° | 60° | 70° | — | — |
| 2003 | 89° | 72° | 80° | — | — |
| 2002 | 94° | 59° | 76° | — | — |
| 2001 | 90° | 54° | 72° | — | — |
| 2000 | 104° | 64° | 84° | — | — |
| 1999 | 89° | 58° | 73° | — | — |
| 1998 | 88° | 54° | 71° | — | — |
| 1997 | 94° | 54° | 74° | — | — |
| 1996warmest | 108° | 67° | 87° | — | — |
| 1995 | 107° | 63° | 85° | — | — |
| 1994 | 81° | 53° | 67° | — | — |
| 1993 | 103° | 61° | 82° | — | — |
| 1992 | 94° | 51° | 72° | — | — |
| 1991 | 102° | 58° | 80° | — | — |
| 1990 | 98° | 58° | 78° | — | — |
| 1989 | 82° | 53° | 68° | — | — |
| 1988 | 87° | 59° | 73° | — | — |
| 1987 | 95° | 55° | 75° | — | — |
| 1986 | 98° | 56° | 77° | — | — |
| 1985 | 80° | 55° | 68° | — | — |
| 1984 | 99° | 57° | 78° | — | — |
| 1983 | 95° | 58° | 76° | — | — |
| 1982 | 102° | 55° | 79° | — | — |
| 1981coldest | 85° | 50° | 67° | — | — |
| 1980 | 102° | 68° | 85° | — | — |
| 1979 | 104° | 62° | 83° | — | — |
| 1978 | 102° | 56° | 79° | — | — |
| 1977 | 106° | 63° | 84° | — | — |
| 1976 | 78° | 60° | 69° | — | — |
| 1975 | 92° | 53° | 72° | — | — |
| 1974 | 97° | 56° | 76° | — | — |
| 1973 | 105° | 58° | 81° | — | — |
| 1972 | 94° | 53° | 73° | — | — |
| 1971 | 98° | 58° | 78° | — | — |
55 years of data from VACAVILLE/NUT TREE AP ASOS