Weather on September 12
Antioch, CA
55 Years of Data
Avg High
86°F
Avg Low
58°F
Warmest
2003
85°F avg
Coldest
2018
61°F avg
About This Date
September 12th 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 12th was in 2003 (85°F average), while the coldest was 2018 (61°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 12th dates historically. The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.
Planning for September 12th in Antioch, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 77° | 61° | 69° | — | — |
| 2024 | 81° | 55° | 68° | — | — |
| 2023 | 79° | 66° | 72° | — | — |
| 2022 | 80° | 65° | 72° | — | — |
| 2021 | 88° | 73° | 80° | — | — |
| 2020 | 88° | 59° | 73° | — | — |
| 2019 | 91° | 61° | 76° | — | — |
| 2018coldest | 69° | 54° | 61° | — | — |
| 2017 | 82° | 59° | 71° | — | — |
| 2016 | 78° | 53° | 66° | — | — |
| 2015 | 106° | 65° | 85° | — | — |
| 2014 | 98° | 60° | 79° | — | — |
| 2013 | 86° | 60° | 73° | — | — |
| 2012 | 86° | 56° | 71° | — | — |
| 2011 | 87° | 61° | 74° | — | — |
| 2010 | 87° | 54° | 70° | — | — |
| 2009 | 98° | 57° | 78° | — | — |
| 2008 | 77° | 52° | 64° | — | — |
| 2007 | 76° | 57° | 66° | — | — |
| 2006 | 99° | 62° | 80° | — | — |
| 2005 | 75° | 52° | 63° | — | — |
| 2004 | 88° | 60° | 74° | — | — |
| 2003warmest | 97° | 73° | 85° | — | — |
| 2002 | 89° | 54° | 71° | — | — |
| 2001 | 82° | 55° | 69° | — | — |
| 2000 | 88° | 57° | 72° | — | — |
| 1999 | 86° | 55° | 71° | — | — |
| 1998 | 92° | 62° | 77° | — | — |
| 1997 | 85° | 61° | 73° | — | — |
| 1996 | 74° | 53° | 63° | — | — |
| 1995 | 86° | 57° | 72° | — | — |
| 1994 | 80° | 54° | 67° | — | — |
| 1993 | 91° | 54° | 72° | — | — |
| 1992 | 81° | 56° | 68° | — | — |
| 1991 | 84° | 54° | 69° | — | — |
| 1990 | 91° | 63° | 77° | — | — |
| 1989 | 82° | 54° | 68° | — | — |
| 1988 | 91° | 67° | 79° | — | — |
| 1987 | 81° | 56° | 68° | — | — |
| 1986 | 86° | 56° | 71° | — | — |
| 1985 | 76° | 50° | 63° | — | — |
| 1984 | 87° | 53° | 70° | — | — |
| 1983 | 99° | 60° | 79° | — | — |
| 1982 | 90° | 59° | 74° | — | — |
| 1981 | 92° | 57° | 74° | — | — |
| 1980 | 84° | 51° | 68° | — | — |
| 1979 | 99° | 63° | 81° | — | — |
| 1978 | 83° | 62° | 72° | — | — |
| 1977 | 78° | 53° | 66° | — | — |
| 1976 | 72° | 57° | 64° | 0.1" | — |
| 1975 | 83° | 54° | 68° | — | — |
| 1974 | 96° | 61° | 78° | — | — |
| 1973 | 77° | 54° | 65° | — | — |
| 1972 | 78° | 53° | 66° | — | — |
| 1971 | 92° | 59° | 75° | — | — |
55 years of data from ANTIOCH FIBREBRD MILLS