Weather on July 21
Vacaville, CA
55 Years of Data
Avg High
94°F
Avg Low
58°F
Warmest
2006
91°F avg
Coldest
1987
66°F avg
About This Date
July 21st in Vacaville, CA typically brings hot summer weather, with average highs around 94°F and lows near 58°F — a 36°F daily swing. Over 55 years of records, the warmest July 21st was in 2006 (91°F average), while the coldest was 1987 (66°F) — a 25°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 July 21st in Vacaville, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 60° | 71° | — | — |
| 2024 | 95° | 63° | 79° | — | — |
| 2023 | 105° | 62° | 84° | — | — |
| 2022 | 104° | 57° | 81° | — | — |
| 2021 | 98° | 57° | 78° | — | — |
| 2020 | 94° | 58° | 76° | — | — |
| 2019 | 93° | 58° | 75° | — | — |
| 2018 | 98° | 69° | 84° | — | — |
| 2017 | 96° | 59° | 78° | — | — |
| 2016 | 93° | 59° | 76° | — | — |
| 2015 | 96° | 62° | 79° | — | — |
| 2014 | 86° | 64° | 75° | — | — |
| 2013 | 97° | 59° | 78° | — | — |
| 2012 | 101° | 59° | 80° | — | — |
| 2011 | 95° | 60° | 78° | — | — |
| 2010 | 82° | 57° | 70° | — | — |
| 2009 | 97° | 61° | 79° | — | — |
| 2008 | 82° | 52° | 67° | — | — |
| 2007 | 95° | 56° | 75° | — | — |
| 2006warmest | 111° | 72° | 91° | — | — |
| 2005 | 92° | 66° | 79° | — | — |
| 2004 | 100° | 60° | 80° | — | — |
| 2003 | 105° | 73° | 89° | — | — |
| 2002 | 93° | 63° | 78° | — | — |
| 2001 | 85° | 55° | 70° | — | — |
| 2000 | 93° | 56° | 74° | — | — |
| 1999 | 84° | 51° | 68° | — | — |
| 1998 | 88° | 57° | 72° | — | — |
| 1997 | 101° | 59° | 80° | — | — |
| 1996 | 104° | 60° | 82° | — | — |
| 1995 | 89° | 55° | 72° | — | — |
| 1994 | 85° | 54° | 69° | — | — |
| 1993 | 90° | 55° | 72° | — | — |
| 1992 | 94° | 57° | 75° | — | — |
| 1991 | 95° | 58° | 76° | — | — |
| 1990 | 105° | 64° | 85° | — | — |
| 1989 | 100° | 59° | 80° | — | — |
| 1988 | 91° | 58° | 74° | — | — |
| 1987coldest | 80° | 52° | 66° | — | — |
| 1986 | 103° | 52° | 77° | — | — |
| 1985 | 91° | 57° | 74° | — | — |
| 1984 | 93° | 56° | 74° | — | — |
| 1983 | 92° | 52° | 72° | — | — |
| 1982 | 84° | 50° | 67° | — | — |
| 1981 | 99° | 53° | 76° | — | — |
| 1980 | 92° | 54° | 73° | — | — |
| 1979 | 93° | 62° | 78° | — | — |
| 1978 | 96° | 40° | 68° | — | — |
| 1977 | 95° | 55° | 75° | — | — |
| 1976 | 90° | 54° | 72° | — | — |
| 1975 | 93° | 54° | 73° | — | — |
| 1974 | 96° | 56° | 76° | — | — |
| 1973 | 88° | 48° | 68° | — | — |
| 1972 | 78° | 58° | 68° | — | — |
| 1971 | 104° | 59° | 82° | — | — |
55 years of data from VACAVILLE/NUT TREE AP ASOS