Weather on August 31
Vallejo, CA
55 Years of Data
Avg High
86°F
Avg Low
55°F
Warmest
2017
80°F avg
Coldest
2008
60°F avg
About This Date
August 31st in Vallejo, CA typically brings warm summer weather, with average highs around 86°F and lows near 55°F — a 31°F daily swing. Over 55 years of records, the warmest August 31st was in 2017 (80°F average), while the coldest was 2008 (60°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 31st dates historically. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
Planning for August 31st in Vallejo, 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 | 98° | 63° | 80° | — | — |
| 2024 | 80° | 57° | 69° | — | — |
| 2023 | 97° | 59° | 78° | — | — |
| 2022 | 88° | 53° | 70° | — | — |
| 2021 | 86° | 56° | 71° | — | — |
| 2020 | 79° | 55° | 67° | — | — |
| 2019 | 97° | 59° | 78° | — | — |
| 2018 | 85° | 56° | 70° | — | — |
| 2017warmest | 104° | 56° | 80° | — | — |
| 2016 | 84° | 57° | 71° | — | — |
| 2015 | 91° | 60° | 76° | — | — |
| 2014 | 84° | 50° | 67° | — | — |
| 2013 | 84° | 54° | 69° | — | — |
| 2012 | 71° | 54° | 62° | — | — |
| 2011 | 73° | 52° | 62° | — | — |
| 2010 | 86° | 51° | 69° | — | — |
| 2009 | 76° | 54° | 65° | — | — |
| 2008coldest | 78° | 42° | 60° | — | — |
| 2007 | 87° | 61° | 74° | — | — |
| 2006 | 87° | 50° | 69° | — | — |
| 2005 | 93° | 54° | 73° | — | — |
| 2004 | 92° | 55° | 73° | — | — |
| 2003 | 80° | 54° | 67° | — | — |
| 2002 | 87° | 53° | 70° | — | — |
| 2001 | 56° | — | — | — | — |
| 2000 | 74° | 55° | 64° | — | — |
| 1999 | 82° | 51° | 67° | — | — |
| 1998 | 94° | 56° | 75° | — | — |
| 1997 | 88° | 58° | 73° | — | — |
| 1996 | 93° | 58° | 75° | — | — |
| 1995 | 89° | 52° | 70° | — | — |
| 1994 | 88° | 54° | 71° | — | — |
| 1993 | 80° | 53° | 67° | — | — |
| 1992 | 84° | 57° | 71° | — | — |
| 1991 | 85° | 53° | 69° | — | — |
| 1990 | 90° | 55° | 72° | — | — |
| 1989 | 90° | 50° | 70° | — | — |
| 1988 | 92° | 55° | 73° | — | — |
| 1987 | 89° | 53° | 71° | — | — |
| 1986 | 89° | 51° | 70° | — | — |
| 1985 | 95° | 51° | 73° | — | — |
| 1984 | 90° | 60° | 75° | 0.28" | — |
| 1983 | 80° | 56° | 68° | — | — |
| 1982 | 94° | 50° | 72° | — | — |
| 1981 | 97° | 55° | 76° | — | — |
| 1980 | 87° | 51° | 69° | — | — |
| 1979 | 84° | 56° | 70° | — | — |
| 1978 | 89° | 54° | 71° | — | — |
| 1977 | 81° | 54° | 67° | — | — |
| 1976 | 88° | 57° | 72° | — | — |
| 1975 | 81° | 51° | 66° | — | — |
| 1974 | 68° | 54° | 61° | — | — |
| 1973 | 75° | 54° | 64° | — | — |
| 1972 | 92° | 57° | 74° | — | — |
| 1971 | 80° | 58° | 69° | — | — |
55 years of data from VALLEJO