Weather on May 21
Vacaville, CA
55 Years of Data
Avg High
82°F
Avg Low
51°F
Warmest
2001
83°F avg
Coldest
2002
55°F avg
About This Date
May 21st in Vacaville, CA typically brings warm spring weather, with average highs around 82°F and lows near 51°F — a 31°F daily swing. Over 55 years of records, the warmest May 21st was in 2001 (83°F average), while the coldest was 2002 (55°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 9% of May 21st dates historically, with the wettest May 21st recording 3.25" 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 21st in Vacaville, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 92° | 49° | 70° | — | — |
| 2024 | 90° | 52° | 71° | — | — |
| 2023 | 88° | 53° | 70° | — | — |
| 2022 | 90° | 53° | 71° | — | — |
| 2021 | 76° | 54° | 65° | — | — |
| 2020 | 86° | 48° | 67° | — | — |
| 2019 | 68° | 50° | 59° | 0.08" | — |
| 2018 | 83° | 48° | 65° | — | — |
| 2017 | 96° | 56° | 76° | — | — |
| 2016 | 69° | 50° | 60° | 0.41" | — |
| 2015 | 75° | 53° | 64° | — | — |
| 2014 | 82° | 50° | 66° | — | — |
| 2013 | 83° | 56° | 69° | — | — |
| 2012 | 83° | 57° | 70° | — | — |
| 2011 | 78° | 53° | 66° | — | — |
| 2010 | 65° | 46° | 55° | — | — |
| 2009 | 87° | 53° | 70° | — | — |
| 2008 | 83° | 57° | 70° | — | — |
| 2007 | 89° | 52° | 70° | — | — |
| 2006 | 69° | 53° | 61° | 3.25" | — |
| 2005 | 87° | 49° | 68° | — | — |
| 2004 | 73° | 51° | 62° | — | — |
| 2003 | 92° | 54° | 73° | — | — |
| 2002coldest | 65° | 45° | 55° | — | — |
| 2001warmest | 101° | 66° | 83° | — | — |
| 2000 | 101° | 59° | 80° | — | — |
| 1999 | 92° | 46° | 69° | — | — |
| 1998 | 70° | 44° | 57° | — | — |
| 1997 | 87° | 49° | 68° | — | — |
| 1996 | 72° | 52° | 62° | 0.61" | — |
| 1995 | 78° | 49° | 63° | — | — |
| 1994 | 76° | 45° | 60° | — | — |
| 1993 | 78° | 53° | 66° | — | — |
| 1992 | 92° | 52° | 72° | — | — |
| 1991 | 87° | 47° | 67° | — | — |
| 1990 | 75° | 53° | 64° | — | — |
| 1989 | 75° | 44° | 60° | — | — |
| 1988 | 92° | 61° | 76° | — | — |
| 1987 | 73° | 48° | 61° | — | — |
| 1986 | 75° | 45° | 60° | — | — |
| 1985 | 88° | 47° | 67° | — | — |
| 1984 | 81° | 49° | 65° | — | — |
| 1983 | 91° | 54° | 72° | — | — |
| 1982 | 79° | 49° | 64° | — | — |
| 1981 | 76° | 47° | 61° | — | — |
| 1980 | 93° | 51° | 72° | — | — |
| 1979 | 73° | 55° | 64° | — | — |
| 1978 | 88° | 55° | 71° | — | — |
| 1977 | 80° | 47° | 63° | — | — |
| 1976 | 83° | 51° | 67° | — | — |
| 1975 | 83° | 45° | 64° | — | — |
| 1974 | 80° | 39° | 60° | — | — |
| 1973 | 85° | 45° | 65° | — | — |
| 1972 | 68° | 50° | 59° | 0.2" | — |
| 1971 | 74° | 45° | 59° | — | — |
55 years of data from VACAVILLE/NUT TREE AP ASOS