Weather on September 11
Antioch, CA
55 Years of Data
Avg High
86°F
Avg Low
58°F
Warmest
2015
84°F avg
Coldest
1985
61°F avg
About This Date
September 11th in Antioch, CA typically brings warm fall weather, with average highs around 86°F and lows near 58°F — a 28°F daily swing. Over 55 years of records, the warmest September 11th was in 2015 (84°F average), while the coldest was 1985 (61°F) — a 23°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
Planning for September 11th in Antioch, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 70° | 55° | 62° | — | — |
| 2024 | 75° | 56° | 65° | — | — |
| 2023 | 83° | 67° | 75° | — | — |
| 2022 | 83° | 67° | 75° | — | — |
| 2021 | 85° | 66° | 75° | — | — |
| 2020 | 85° | 58° | 71° | — | — |
| 2019 | 87° | 59° | 73° | — | — |
| 2018 | 79° | 59° | 69° | — | — |
| 2017 | 89° | 70° | 79° | — | — |
| 2016 | 96° | 55° | 76° | — | — |
| 2015warmest | 107° | 61° | 84° | — | — |
| 2014 | 96° | 59° | 78° | — | — |
| 2013 | 78° | 62° | 70° | — | — |
| 2012 | 89° | 57° | 73° | — | — |
| 2011 | 83° | 61° | 72° | — | — |
| 2010 | 89° | 57° | 73° | — | — |
| 2009 | 96° | 56° | 76° | — | — |
| 2008 | 84° | 53° | 69° | — | — |
| 2007 | 86° | 57° | 72° | — | — |
| 2006 | 90° | 57° | 73° | — | — |
| 2005 | 76° | — | — | — | — |
| 2004 | 92° | 58° | 75° | — | — |
| 2003 | 91° | 73° | 82° | — | — |
| 2002 | 93° | 58° | 75° | — | — |
| 2001 | 84° | 58° | 71° | — | — |
| 2000 | 91° | 54° | 72° | — | — |
| 1999 | 81° | 57° | 69° | — | — |
| 1998 | 85° | 59° | 72° | — | — |
| 1997 | 80° | 64° | 72° | — | — |
| 1996 | 91° | 56° | 73° | — | — |
| 1995 | 82° | 53° | 68° | — | — |
| 1994 | 82° | 55° | 69° | — | — |
| 1993 | 97° | 58° | 77° | — | — |
| 1992 | 80° | 57° | 69° | — | — |
| 1991 | 78° | 54° | 66° | — | — |
| 1990 | 92° | 57° | 74° | — | — |
| 1989 | 81° | 51° | 66° | — | — |
| 1988 | 84° | 58° | 71° | — | — |
| 1987 | 82° | 55° | 69° | — | — |
| 1986 | 88° | 55° | 71° | — | — |
| 1985coldest | 73° | 49° | 61° | — | — |
| 1984 | 94° | 53° | 73° | — | — |
| 1983 | 95° | 54° | 74° | — | — |
| 1982 | 88° | 61° | 74° | — | — |
| 1981 | 90° | 55° | 72° | — | — |
| 1980 | 84° | 56° | 70° | — | — |
| 1979 | 95° | 59° | 77° | — | — |
| 1978 | 76° | 57° | 66° | — | — |
| 1977 | 80° | 53° | 67° | — | — |
| 1976 | 83° | 62° | 72° | — | — |
| 1975 | 79° | 57° | 68° | — | — |
| 1974 | 95° | 69° | 82° | — | — |
| 1973 | 76° | 58° | 67° | — | — |
| 1972 | 79° | 53° | 66° | — | — |
| 1971 | 93° | 65° | 79° | — | — |
55 years of data from ANTIOCH FIBREBRD MILLS