Weather on September 21
Antioch, CA
55 Years of Data
Avg High
84°F
Avg Low
57°F
Warmest
2009
83°F avg
Coldest
2017
56°F avg
About This Date
September 21st in Antioch, CA typically brings warm fall weather, with average highs around 84°F and lows near 57°F — a 27°F daily swing. Over 55 years of records, the warmest September 21st was in 2009 (83°F average), while the coldest was 2017 (56°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 21st dates historically, with the wettest September 21st recording 1.27" of rain. The last decade has been 1.3°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.3°F cooler on this date compared to 20-30 years ago.
Planning for September 21st 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 | 82° | 65° | 73° | — | — |
| 2024 | 83° | 66° | 74° | — | — |
| 2023 | 72° | 53° | 62° | — | — |
| 2022 | 70° | 56° | 63° | — | — |
| 2021 | 88° | 69° | 78° | — | — |
| 2020 | 88° | 59° | 73° | — | — |
| 2019 | 86° | 61° | 73° | — | — |
| 2018 | 86° | 67° | 76° | — | — |
| 2017coldest | 64° | 48° | 56° | — | — |
| 2016 | 80° | 64° | 72° | — | — |
| 2015 | 87° | 61° | 74° | — | — |
| 2014 | 80° | 61° | 70° | — | — |
| 2013 | 70° | 60° | 65° | 1.27" | — |
| 2012 | 93° | 56° | 74° | — | — |
| 2011 | 100° | 61° | 80° | — | — |
| 2010 | 80° | 52° | 66° | — | — |
| 2009warmest | 93° | 73° | 83° | — | — |
| 2008 | 82° | 56° | 69° | — | — |
| 2007 | 72° | 51° | 61° | — | — |
| 2006 | 86° | 63° | 74° | — | — |
| 2005 | 84° | 54° | 69° | — | — |
| 2004 | 81° | 54° | 67° | — | — |
| 2003 | 97° | 62° | 79° | — | — |
| 2002 | 93° | 58° | 75° | — | — |
| 2001 | 83° | 53° | 68° | — | — |
| 2000 | 78° | 61° | 69° | — | — |
| 1999 | 89° | 55° | 72° | — | — |
| 1998 | 79° | 55° | 67° | — | — |
| 1997 | 90° | 59° | 74° | — | — |
| 1996 | 89° | 58° | 73° | — | — |
| 1995 | 97° | 57° | 77° | — | — |
| 1994 | 90° | 57° | 73° | — | — |
| 1993 | 88° | 55° | 71° | — | — |
| 1992 | 94° | 56° | 75° | — | — |
| 1991 | 83° | 54° | 68° | — | — |
| 1990 | 98° | 60° | 79° | — | — |
| 1989 | 75° | 56° | 65° | — | — |
| 1988 | 81° | 51° | 66° | — | — |
| 1987 | 94° | 58° | 76° | — | — |
| 1986 | 74° | 50° | 62° | — | — |
| 1985 | 86° | 52° | 69° | — | — |
| 1984 | 82° | 60° | 71° | — | — |
| 1983 | 93° | 68° | 81° | — | — |
| 1982 | 81° | 50° | 65° | — | — |
| 1981 | 88° | 58° | 73° | — | — |
| 1980 | 82° | 54° | 68° | — | — |
| 1979 | 92° | 50° | 71° | — | — |
| 1978 | 83° | 46° | 64° | — | — |
| 1977 | 79° | 52° | 65° | — | — |
| 1976 | 80° | 49° | 64° | — | — |
| 1975 | 89° | 56° | 72° | — | — |
| 1974 | 87° | 56° | 71° | — | — |
| 1973 | 81° | 59° | 70° | — | — |
| 1972 | 84° | 54° | 69° | — | — |
| 1971 | 79° | 57° | 68° | — | — |
55 years of data from ANTIOCH FIBREBRD MILLS