Weather on September 18
Antioch, CA
55 Years of Data
Avg High
83°F
Avg Low
58°F
Warmest
2000
85°F avg
Coldest
2021
58°F avg
About This Date
September 18th in Antioch, CA typically brings warm fall weather, with average highs around 83°F and lows near 58°F — a 25°F daily swing. Over 55 years of records, the warmest September 18th was in 2000 (85°F average), while the coldest was 2021 (58°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 4% of September 18th dates historically, with the wettest September 18th recording 0.74" of rain. The last decade has been 5.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 5.6°F cooler on this date compared to 20-30 years ago.
Planning for September 18th in Antioch, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 68° | 75° | — | — |
| 2024 | 71° | 55° | 63° | — | — |
| 2023 | 72° | 55° | 63° | — | — |
| 2022 | 65° | 54° | 59° | — | — |
| 2021coldest | 64° | 51° | 58° | — | — |
| 2020 | 82° | 64° | 73° | — | — |
| 2019 | 77° | 63° | 70° | — | — |
| 2018 | 72° | 56° | 64° | — | — |
| 2017 | 68° | 53° | 61° | — | — |
| 2016 | 98° | 59° | 79° | — | — |
| 2015 | 85° | 60° | 72° | — | — |
| 2014 | 83° | 66° | 74° | — | — |
| 2013 | 85° | 63° | 74° | — | — |
| 2012 | 83° | 51° | 67° | — | — |
| 2011 | 100° | 62° | 81° | — | — |
| 2010 | 72° | 58° | 65° | — | — |
| 2009 | 96° | 62° | 79° | — | — |
| 2008 | 78° | 54° | 66° | — | — |
| 2007 | 85° | 55° | 70° | — | — |
| 2006 | 88° | 55° | 71° | — | — |
| 2005 | 81° | 54° | 67° | — | — |
| 2004 | 72° | 57° | 64° | — | — |
| 2003 | 88° | 59° | 73° | — | — |
| 2002 | 91° | 62° | 77° | — | — |
| 2001 | 89° | 56° | 72° | — | — |
| 2000warmest | 98° | 71° | 85° | — | — |
| 1999 | 82° | 53° | 68° | — | — |
| 1998 | 81° | 62° | 71° | — | — |
| 1997 | 85° | 58° | 71° | — | — |
| 1996 | 83° | 63° | 73° | — | — |
| 1995 | 89° | 60° | 75° | — | — |
| 1994 | 84° | 54° | 69° | — | — |
| 1993 | 76° | 52° | 64° | — | — |
| 1992 | 84° | 55° | 70° | — | — |
| 1991 | 95° | 57° | 76° | — | — |
| 1990 | 86° | 60° | 73° | — | — |
| 1989 | 68° | 56° | 62° | 0.74" | — |
| 1988 | 89° | 65° | 77° | — | — |
| 1987 | 89° | 53° | 71° | — | — |
| 1986 | 73° | 52° | 62° | 0.05" | — |
| 1985 | 78° | 53° | 66° | — | — |
| 1984 | 97° | 68° | 82° | — | — |
| 1983 | 87° | 52° | 69° | — | — |
| 1982 | 71° | 58° | 64° | — | — |
| 1981 | 87° | 54° | 70° | — | — |
| 1980 | 86° | 60° | 73° | — | — |
| 1979 | 95° | 56° | 75° | — | — |
| 1978 | 80° | 54° | 67° | — | — |
| 1977 | 77° | 51° | 64° | — | — |
| 1976 | 83° | 54° | 68° | — | — |
| 1975 | 89° | 58° | 73° | — | — |
| 1974 | 88° | 56° | 72° | — | — |
| 1973 | 78° | 52° | 65° | — | — |
| 1972 | 77° | 55° | 66° | — | — |
| 1971 | 82° | 60° | 71° | — | — |
55 years of data from ANTIOCH FIBREBRD MILLS