Weather on August 9
Antioch, CA
55 Years of Data
Avg High
91°F
Avg Low
60°F
Warmest
1990
89°F avg
Coldest
2001
62°F avg
About This Date
August 9th in Antioch, CA typically brings hot summer weather, with average highs around 91°F and lows near 60°F — a 31°F daily swing. Over 54 years of records, the warmest August 9th was in 1990 (89°F average), while the coldest was 2001 (62°F) — a 27°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
Planning for August 9th in Antioch, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 92° | 75° | 83° | — | — |
| 2024 | 86° | 73° | 80° | — | — |
| 2023 | 84° | 61° | 72° | — | — |
| 2022 | 75° | 58° | 66° | — | — |
| 2021 | 92° | 59° | 75° | — | — |
| 2020 | 96° | 61° | 78° | — | — |
| 2019 | 85° | 62° | 73° | — | — |
| 2018 | 97° | 62° | 79° | — | — |
| 2017 | 74° | 65° | 69° | — | — |
| 2016 | 91° | 59° | 75° | — | — |
| 2015 | 87° | 62° | 75° | — | — |
| 2014 | 90° | 63° | 76° | — | — |
| 2013 | 84° | 58° | 71° | — | — |
| 2012 | 96° | 75° | 86° | — | — |
| 2011 | 90° | 58° | 74° | — | — |
| 2010 | 84° | 55° | 70° | — | — |
| 2009 | 91° | 71° | 81° | — | — |
| 2008 | 88° | 55° | 71° | — | — |
| 2007 | 88° | 59° | 73° | — | — |
| 2006 | 96° | 65° | 80° | — | — |
| 2005 | 92° | 59° | 75° | — | — |
| 2004 | 92° | 57° | 74° | — | — |
| 2003 | 88° | 61° | 74° | — | — |
| 2002 | 101° | 65° | 83° | — | — |
| 2001coldest | 72° | 52° | 62° | — | — |
| 2000 | 84° | 56° | 70° | — | — |
| 1999 | 82° | 56° | 69° | — | — |
| 1998 | 90° | 57° | 73° | — | — |
| 1997 | 94° | 61° | 77° | — | — |
| 1996 | 96° | 60° | 78° | — | — |
| 1995 | 92° | 63° | 77° | — | — |
| 1994 | 93° | 54° | 73° | — | — |
| 1992 | 90° | 59° | 74° | — | — |
| 1991 | 94° | 64° | 79° | — | — |
| 1990warmest | 104° | 73° | 89° | — | — |
| 1989 | 88° | 60° | 74° | — | — |
| 1988 | 92° | 55° | 73° | — | — |
| 1987 | 90° | 59° | 74° | — | — |
| 1986 | 99° | 54° | 76° | — | — |
| 1985 | 91° | 58° | 74° | — | — |
| 1984 | 103° | 59° | 81° | — | — |
| 1983 | 100° | — | — | — | — |
| 1982 | 96° | 57° | 77° | — | — |
| 1981 | 103° | 59° | 81° | — | — |
| 1980 | 91° | 47° | 69° | — | — |
| 1979 | 92° | 53° | 72° | — | — |
| 1978 | 100° | 66° | 83° | — | — |
| 1977 | 88° | 53° | 70° | — | — |
| 1976 | 89° | 53° | 71° | — | — |
| 1975 | 100° | 57° | 79° | — | — |
| 1974 | 88° | 61° | 74° | — | — |
| 1973 | 78° | 56° | 67° | — | — |
| 1972 | 89° | 63° | 76° | — | — |
| 1971 | 94° | 74° | 84° | — | — |
54 years of data from ANTIOCH FIBREBRD MILLS