Weather on August 20
Vallejo, CA
55 Years of Data
Avg High
82°F
Avg Low
55°F
Warmest
1995
77°F avg
Coldest
1973
60°F avg
About This Date
August 20th in Vallejo, CA typically brings warm summer weather, with average highs around 82°F and lows near 55°F — a 27°F daily swing. Over 55 years of records, the warmest August 20th was in 1995 (77°F average), while the coldest was 1973 (60°F) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 5% of August 20th dates historically, with the wettest August 20th recording 1.65" of rain. The last decade has been 6.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.0°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Vallejo, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 95° | 58° | 76° | — | — |
| 2024 | 88° | 58° | 73° | — | — |
| 2023 | 94° | 60° | 77° | — | — |
| 2022 | 93° | 57° | 75° | — | — |
| 2021 | 76° | 57° | 66° | — | — |
| 2020 | 88° | 57° | 72° | — | — |
| 2019 | 83° | 59° | 71° | — | — |
| 2018 | 86° | 55° | 71° | — | — |
| 2017 | 79° | 58° | 68° | — | — |
| 2016 | 80° | 55° | 68° | — | — |
| 2015 | 80° | 59° | 70° | — | — |
| 2014 | 72° | 60° | 66° | — | — |
| 2013 | 77° | 59° | 68° | — | — |
| 2012 | 73° | 54° | 63° | — | — |
| 2011 | 70° | 55° | 62° | — | — |
| 2010 | 72° | 51° | 61° | — | — |
| 2009 | 75° | 52° | 63° | — | — |
| 2008 | 83° | 53° | 68° | — | — |
| 2007 | 87° | 55° | 71° | — | — |
| 2006 | 80° | 56° | 68° | — | — |
| 2005 | 73° | 54° | 63° | — | — |
| 2004 | 78° | 58° | 68° | — | — |
| 2003 | 79° | 50° | 64° | — | — |
| 2002 | 79° | 54° | 66° | — | — |
| 2001 | 67° | 55° | 61° | — | — |
| 2000 | 80° | 46° | 63° | — | — |
| 1999 | 84° | 56° | 70° | — | — |
| 1998 | 76° | 55° | 65° | — | — |
| 1997 | 78° | 60° | 69° | 1.65" | — |
| 1996 | 85° | 52° | 68° | — | — |
| 1995warmest | 95° | 59° | 77° | — | — |
| 1994 | 91° | 52° | 71° | — | — |
| 1993 | 88° | 55° | 71° | — | — |
| 1992 | 93° | 57° | 75° | — | — |
| 1991 | 84° | 59° | 72° | — | — |
| 1990 | 82° | 57° | 70° | — | — |
| 1989 | 78° | 53° | 66° | — | — |
| 1988 | 84° | 55° | 70° | — | — |
| 1987 | 82° | 48° | 65° | — | — |
| 1986 | 90° | 52° | 71° | — | — |
| 1985 | 86° | 47° | 66° | — | — |
| 1984 | 85° | 61° | 73° | — | — |
| 1983 | 82° | 52° | 67° | 1.42" | — |
| 1982 | 93° | 50° | 72° | 0.05" | — |
| 1981 | 84° | 61° | 72° | — | — |
| 1980 | 87° | 55° | 71° | — | — |
| 1979 | 82° | 58° | 70° | — | — |
| 1978 | 89° | — | — | — | — |
| 1977 | 86° | 55° | 71° | — | — |
| 1976 | 82° | — | — | — | — |
| 1975 | 75° | 54° | 64° | — | — |
| 1974 | 82° | 58° | 70° | — | — |
| 1973coldest | 71° | 49° | 60° | — | — |
| 1972 | 82° | 59° | 71° | — | — |
| 1971 | 81° | 55° | 68° | — | — |
55 years of data from VALLEJO