Weather on August 15
Vacaville, CA
55 Years of Data
Avg High
93°F
Avg Low
57°F
Warmest
2020
90°F avg
Coldest
1976
64°F avg
About This Date
August 15th in Vacaville, CA typically brings hot summer weather, with average highs around 93°F and lows near 57°F — a 36°F daily swing. Over 55 years of records, the warmest August 15th was in 2020 (90°F average), while the coldest was 1976 (64°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 15th dates historically. 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 15th in Vacaville, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 96° | 60° | 78° | — | — |
| 2024 | 94° | 63° | 78° | — | — |
| 2023 | 103° | 68° | 85° | 0.03" | — |
| 2022 | 103° | 59° | 81° | — | — |
| 2021 | 101° | 62° | 81° | — | — |
| 2020warmest | 111° | 70° | 90° | — | — |
| 2019 | 106° | 65° | 85° | — | — |
| 2018 | 90° | 58° | 74° | — | — |
| 2017 | 82° | 58° | 70° | — | — |
| 2016 | 94° | 56° | 75° | — | — |
| 2015 | 100° | 58° | 79° | — | — |
| 2014 | 94° | 56° | 75° | — | — |
| 2013 | 96° | 60° | 78° | — | — |
| 2012 | 99° | 66° | 82° | — | — |
| 2011 | 91° | 57° | 74° | — | — |
| 2010 | 89° | 54° | 71° | — | — |
| 2009 | 95° | 59° | 77° | — | — |
| 2008 | 108° | 64° | 86° | — | — |
| 2007 | 96° | 58° | 77° | — | — |
| 2006 | 85° | 54° | 69° | — | — |
| 2005 | 83° | 58° | 70° | — | — |
| 2004 | 89° | 54° | 71° | — | — |
| 2003 | 96° | 53° | 75° | — | — |
| 2002 | 96° | 59° | 78° | — | — |
| 2001 | 95° | 56° | 75° | — | — |
| 2000 | 97° | 55° | 76° | — | — |
| 1999 | 89° | 54° | 71° | — | — |
| 1998 | 98° | 58° | 78° | — | — |
| 1997 | 96° | 58° | 77° | — | — |
| 1996 | 107° | 59° | 83° | — | — |
| 1995 | 101° | 62° | 81° | — | — |
| 1994 | 105° | 54° | 79° | — | — |
| 1993 | 81° | 53° | 67° | — | — |
| 1992 | 105° | 68° | 87° | — | — |
| 1991 | 88° | 60° | 74° | — | — |
| 1990 | 84° | 55° | 70° | — | — |
| 1989 | 102° | 59° | 81° | — | — |
| 1988 | 87° | 54° | 70° | — | — |
| 1987 | 84° | 50° | 67° | — | — |
| 1986 | 89° | 53° | 71° | — | — |
| 1985 | 83° | 52° | 67° | — | — |
| 1984 | 90° | 57° | 73° | — | — |
| 1983 | 100° | 70° | 85° | — | — |
| 1982 | 86° | 53° | 70° | — | — |
| 1981 | 93° | 60° | 77° | — | — |
| 1980 | 87° | 54° | 70° | — | — |
| 1979 | 85° | 51° | 68° | — | — |
| 1978 | 93° | 55° | 74° | — | — |
| 1977 | 98° | 50° | 74° | — | — |
| 1976coldest | 73° | 56° | 64° | 0.33" | — |
| 1975 | 82° | 50° | 66° | — | — |
| 1974 | 89° | 53° | 71° | — | — |
| 1973 | 101° | 50° | 75° | — | — |
| 1972 | 80° | 53° | 67° | — | — |
| 1971 | 97° | 54° | 75° | — | — |
55 years of data from VACAVILLE/NUT TREE AP ASOS