Weather on May 15
Vacaville, CA
55 Years of Data
Avg High
81°F
Avg Low
52°F
Warmest
2008
89°F avg
Coldest
2011
53°F avg
About This Date
May 15th in Vacaville, CA typically brings warm spring weather, with average highs around 81°F and lows near 52°F — a 29°F daily swing. Over 55 years of records, the warmest May 15th was in 2008 (89°F average), while the coldest was 2011 (53°F) — a 36°F range across recorded history. Rain or other precipitation has occurred on about 11% of May 15th dates historically, with the wettest May 15th recording 2.84" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for May 15th in Vacaville, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 85° | 46° | 65° | — | — |
| 2024 | 93° | 55° | 74° | — | — |
| 2023 | 86° | 52° | 69° | — | — |
| 2022 | 93° | 54° | 73° | — | — |
| 2021 | 73° | 51° | 62° | — | — |
| 2020 | 81° | 47° | 64° | — | — |
| 2019 | 65° | 54° | 59° | 2.84" | — |
| 2018 | 74° | 53° | 63° | — | — |
| 2017 | 77° | 47° | 62° | — | — |
| 2016 | 81° | 51° | 66° | — | — |
| 2015 | 74° | 51° | 62° | — | — |
| 2014 | 95° | 50° | 73° | — | — |
| 2013 | 78° | 54° | 66° | — | — |
| 2012 | 79° | 52° | 65° | — | — |
| 2011coldest | 61° | 45° | 53° | 0.43" | — |
| 2010 | 84° | 51° | 68° | — | — |
| 2009 | 94° | 58° | 76° | — | — |
| 2008warmest | 100° | 77° | 89° | — | — |
| 2007 | 80° | 53° | 67° | — | — |
| 2006 | 91° | 62° | 77° | — | — |
| 2005 | 78° | 61° | 69° | — | — |
| 2004 | 82° | 55° | 69° | — | — |
| 2003 | 73° | 52° | 62° | — | — |
| 2002 | 86° | 50° | 68° | — | — |
| 2001 | 80° | 62° | 71° | — | — |
| 2000 | 68° | 51° | 60° | 0.79" | — |
| 1999 | 73° | 40° | 56° | — | — |
| 1998 | 68° | 41° | 55° | — | — |
| 1997 | 92° | 59° | 75° | — | — |
| 1996 | 71° | 59° | 65° | 2.29" | — |
| 1995 | 69° | 49° | 59° | 0.05" | — |
| 1994 | 82° | 50° | 66° | — | — |
| 1993 | 83° | — | — | — | — |
| 1992 | 84° | 48° | 66° | — | — |
| 1991 | 84° | 48° | 66° | — | — |
| 1990 | 82° | 49° | 65° | — | — |
| 1989 | 85° | 50° | 67° | 0.05" | — |
| 1988 | 77° | 52° | 64° | — | — |
| 1987 | 94° | 58° | 76° | — | — |
| 1986 | 83° | 49° | 66° | — | — |
| 1985 | 87° | 47° | 67° | — | — |
| 1984 | 71° | 49° | 60° | — | — |
| 1983 | 75° | 51° | 63° | — | — |
| 1982 | 86° | 47° | 66° | — | — |
| 1981 | 74° | 54° | 64° | — | — |
| 1980 | 78° | 46° | 62° | — | — |
| 1979 | 88° | 51° | 69° | — | — |
| 1978 | 72° | 52° | 62° | — | — |
| 1977 | 74° | 42° | 58° | — | — |
| 1976 | 96° | 66° | 81° | — | — |
| 1975 | 76° | 46° | 61° | — | — |
| 1974 | 74° | 48° | 61° | — | — |
| 1973 | 89° | 51° | 70° | — | — |
| 1972 | 94° | 53° | 73° | — | — |
| 1971 | 80° | 45° | 62° | — | — |
55 years of data from VACAVILLE/NUT TREE AP ASOS