Weather on September 30
Antioch, CA
55 Years of Data
Avg High
83°F
Avg Low
56°F
Warmest
2018
93°F avg
Coldest
1971
58°F avg
About This Date
September 30th in Antioch, CA typically brings warm fall weather, with average highs around 83°F and lows near 56°F — a 27°F daily swing. Over 55 years of records, the warmest September 30th was in 2018 (93°F average), while the coldest was 1971 (58°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 7% of September 30th dates historically, with the wettest September 30th recording 1.6" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 30th in Antioch, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 71° | 57° | 64° | — | — |
| 2024 | 90° | 70° | 80° | — | — |
| 2023 | 66° | 52° | 59° | — | — |
| 2022 | 86° | 67° | 76° | — | — |
| 2021 | 82° | 63° | 72° | — | — |
| 2020 | 97° | 62° | 79° | — | — |
| 2019 | 69° | 49° | 59° | — | — |
| 2018warmest | 126° | 60° | 93° | — | — |
| 2017 | 75° | 56° | 65° | — | — |
| 2016 | 74° | 52° | 63° | — | — |
| 2015 | 66° | 58° | 62° | 0.03" | — |
| 2014 | 80° | 55° | 68° | — | — |
| 2013 | 78° | 59° | 69° | — | — |
| 2012 | 97° | 57° | 77° | — | — |
| 2011 | 90° | 57° | 73° | — | — |
| 2010 | 87° | 57° | 72° | — | — |
| 2009 | 70° | 49° | 59° | — | — |
| 2008 | 83° | 58° | 70° | — | — |
| 2007 | 75° | 52° | 63° | — | — |
| 2006 | 76° | 51° | 63° | — | — |
| 2005 | 92° | 62° | 77° | — | — |
| 2004 | 70° | 51° | 60° | — | — |
| 2003 | 83° | 53° | 68° | — | — |
| 2002 | 74° | 50° | 62° | — | — |
| 2001 | 91° | 61° | 76° | — | — |
| 2000 | 91° | 57° | 74° | — | — |
| 1999 | 92° | 64° | 78° | — | — |
| 1998 | 74° | 53° | 63° | — | — |
| 1997 | 93° | 57° | 75° | — | — |
| 1996 | 83° | 54° | 68° | — | — |
| 1995 | 80° | 55° | 68° | — | — |
| 1994 | 81° | 57° | 69° | — | — |
| 1993 | 92° | 61° | 76° | — | — |
| 1992 | 86° | 59° | 73° | — | — |
| 1991 | 94° | 62° | 78° | — | — |
| 1990 | 98° | 58° | 78° | — | — |
| 1989 | 72° | 56° | 64° | — | — |
| 1988 | 93° | 57° | 75° | — | — |
| 1987 | 95° | 61° | 78° | — | — |
| 1986 | 81° | 54° | 67° | — | — |
| 1985 | 72° | 48° | 60° | — | — |
| 1984 | 87° | 58° | 72° | — | — |
| 1983 | 77° | 58° | 67° | 1.6" | — |
| 1982 | 77° | 52° | 64° | — | — |
| 1981 | 80° | 52° | 66° | — | — |
| 1980 | 90° | 54° | 72° | — | — |
| 1979 | 87° | 55° | 71° | — | — |
| 1978 | 94° | 57° | 75° | — | — |
| 1977 | 74° | 49° | 61° | — | — |
| 1976 | 77° | 60° | 69° | 0.03" | — |
| 1975 | 87° | 50° | 69° | — | — |
| 1974 | 84° | 50° | 67° | — | — |
| 1973 | 86° | 56° | 71° | — | — |
| 1972 | 85° | 61° | 73° | — | — |
| 1971coldest | 68° | 49° | 58° | 0.18" | — |
55 years of data from ANTIOCH FIBREBRD MILLS