Weather on September 9
Antioch, CA
55 Years of Data
Avg High
87°F
Avg Low
59°F
Warmest
2022
86°F avg
Coldest
1985
61°F avg
About This Date
September 9th in Antioch, CA typically brings warm fall weather, with average highs around 87°F and lows near 59°F — a 28°F daily swing. Over 55 years of records, the warmest September 9th was in 2022 (86°F average), while the coldest was 1985 (61°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 9th dates historically. The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.6°F warmer on this date compared to 20-30 years ago.
Planning for September 9th in Antioch, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 70° | 58° | 64° | — | — |
| 2024 | 89° | 53° | 71° | — | — |
| 2023 | 83° | 69° | 76° | — | — |
| 2022warmest | 101° | 72° | 86° | — | — |
| 2021 | 88° | 75° | 81° | — | — |
| 2020 | 83° | 62° | 72° | — | — |
| 2019 | 84° | 61° | 72° | — | — |
| 2018 | 86° | 65° | 75° | — | — |
| 2017 | 85° | 63° | 74° | — | — |
| 2016 | 87° | 56° | 71° | — | — |
| 2015 | 104° | 57° | 81° | — | — |
| 2014 | 84° | 52° | 68° | — | — |
| 2013 | 99° | 64° | 81° | — | — |
| 2012 | 86° | 58° | 72° | — | — |
| 2011 | 96° | 61° | 78° | — | — |
| 2010 | 80° | 56° | 68° | — | — |
| 2009 | 97° | 55° | 76° | — | — |
| 2008 | 99° | 55° | 77° | — | — |
| 2007 | 83° | 58° | 70° | — | — |
| 2006 | 79° | 53° | 66° | — | — |
| 2005 | 76° | 54° | 65° | — | — |
| 2004 | 94° | 57° | 75° | — | — |
| 2003 | 70° | 61° | 65° | — | — |
| 2002 | 91° | 58° | 74° | — | — |
| 2001 | 78° | 55° | 67° | — | — |
| 2000 | 85° | 55° | 70° | — | — |
| 1999 | 85° | 59° | 72° | — | — |
| 1998 | 69° | 58° | 63° | 0.3" | — |
| 1997 | 92° | 64° | 78° | — | — |
| 1996 | 94° | 61° | 77° | — | — |
| 1995 | 88° | 56° | 72° | — | — |
| 1994 | 84° | 60° | 72° | — | — |
| 1993 | 98° | 60° | 79° | — | — |
| 1992 | 93° | 58° | 75° | — | — |
| 1991 | 91° | 56° | 73° | — | — |
| 1990 | 91° | 57° | 74° | — | — |
| 1989 | 85° | 54° | 69° | — | — |
| 1988 | 82° | 58° | 70° | — | — |
| 1987 | 90° | 62° | 76° | — | — |
| 1986 | 76° | 52° | 64° | — | — |
| 1985coldest | 72° | 51° | 61° | 0.41" | — |
| 1984 | 102° | 64° | 83° | — | — |
| 1983 | 82° | 55° | 69° | — | — |
| 1982 | 94° | 57° | 75° | — | — |
| 1981 | 90° | 57° | 73° | — | — |
| 1980 | 82° | 53° | 68° | — | — |
| 1979 | 88° | 58° | 73° | — | — |
| 1978 | 83° | 53° | 68° | — | — |
| 1977 | 100° | 54° | 77° | — | — |
| 1976 | 98° | 59° | 79° | — | — |
| 1975 | 76° | 60° | 68° | — | — |
| 1974 | 89° | 60° | 75° | — | — |
| 1973 | 95° | 66° | 81° | — | — |
| 1972 | 85° | 55° | 70° | — | — |
| 1971 | 95° | 58° | 76° | — | — |
55 years of data from ANTIOCH FIBREBRD MILLS