Weather on August 9
Vallejo, CA
55 Years of Data
Avg High
87°F
Avg Low
56°F
Warmest
1984
80°F avg
Coldest
2010
61°F avg
About This Date
August 9th in Vallejo, CA typically brings warm summer weather, with average highs around 87°F and lows near 56°F — a 31°F daily swing. Over 55 years of records, the warmest August 9th was in 1984 (80°F average), while the coldest was 2010 (61°F) — a 19°F range across recorded history. This date has historically been dry, with little recorded precipitation. 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 August 9th in Vallejo, CA? Stay hydrated and seek shade during peak afternoon hours.
Cooling Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 94° | 58° | 76° | — | — |
| 2024 | 85° | 53° | 69° | — | — |
| 2023 | 81° | 56° | 68° | — | — |
| 2022 | 82° | 58° | 70° | — | — |
| 2021 | 84° | 56° | 70° | — | — |
| 2020 | 92° | 57° | 74° | — | — |
| 2019 | 84° | 55° | 70° | — | — |
| 2018 | 97° | 53° | 75° | — | — |
| 2017 | 82° | 57° | 70° | — | — |
| 2016 | 90° | 54° | 72° | — | — |
| 2015 | 89° | 57° | 73° | — | — |
| 2014 | 69° | 54° | 61° | — | — |
| 2013 | 75° | 55° | 65° | — | — |
| 2012 | 88° | 50° | 69° | — | — |
| 2011 | 76° | 55° | 65° | — | — |
| 2010coldest | 71° | 52° | 61° | — | — |
| 2009 | 92° | 49° | 70° | — | — |
| 2008 | 78° | 50° | 64° | — | — |
| 2007 | 78° | 57° | 68° | — | — |
| 2006 | 94° | 58° | 76° | — | — |
| 2005 | 78° | 50° | 64° | — | — |
| 2004 | 89° | 57° | 73° | — | — |
| 2003 | 83° | 57° | 70° | — | — |
| 2002 | 101° | 55° | 78° | — | — |
| 2001 | 90° | 54° | 72° | — | — |
| 2000 | 76° | 56° | 66° | — | — |
| 1999 | 76° | 56° | 66° | — | — |
| 1998 | 80° | 55° | 68° | — | — |
| 1997 | 81° | 61° | 71° | — | — |
| 1996 | 101° | 55° | 78° | — | — |
| 1995 | 95° | 58° | 76° | — | — |
| 1994 | 89° | 50° | 70° | — | — |
| 1993 | 85° | 62° | 73° | — | — |
| 1992 | 97° | 57° | 77° | — | — |
| 1991 | 93° | 58° | 75° | — | — |
| 1990 | 99° | 61° | 80° | — | — |
| 1989 | 90° | 54° | 72° | — | — |
| 1988 | 90° | 60° | 75° | — | — |
| 1987 | 86° | 52° | 69° | — | — |
| 1986 | 88° | 51° | 69° | — | — |
| 1985 | 94° | 52° | 73° | — | — |
| 1984warmest | 102° | 57° | 80° | — | — |
| 1983 | 91° | 55° | 73° | — | — |
| 1982 | 85° | 53° | 69° | — | — |
| 1981 | 88° | 54° | 71° | — | — |
| 1980 | 89° | 63° | 76° | — | — |
| 1979 | 95° | 62° | 79° | — | — |
| 1978 | 100° | 56° | 78° | — | — |
| 1977 | 85° | 53° | 69° | — | — |
| 1976 | 85° | 56° | 70° | — | — |
| 1975 | 96° | 55° | 76° | — | — |
| 1974 | 86° | 59° | 73° | — | — |
| 1973 | 70° | 55° | 62° | — | — |
| 1972 | 92° | 57° | 74° | — | — |
| 1971 | 93° | 56° | 74° | — | — |
55 years of data from VALLEJO