Weather on September 20
Antioch, CA
55 Years of Data
About This Date
September 20th 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 20th was in 2015 (82°F average), while the coldest was 2017 (58°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 20th dates historically. The last decade has been 2.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.2°F cooler on this date compared to 20-30 years ago.
Planning for September 20th in Antioch, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 81° | 62° | 71° | — | — |
| 2024 | 77° | 60° | 69° | — | — |
| 2023 | 70° | 55° | 62° | — | — |
| 2022 | 69° | 54° | 61° | — | — |
| 2021 | 84° | 62° | 73° | — | — |
| 2020 | 90° | 60° | 75° | — | — |
| 2019 | 84° | 61° | 72° | — | — |
| 2018 | 87° | 68° | 78° | — | — |
| 2017coldest | 65° | 51° | 58° | — | — |
| 2016 | 85° | 61° | 73° | — | — |
| 2015warmest | 99° | 66° | 82° | — | — |
| 2014 | 85° | 61° | 73° | — | — |
| 2013 | 78° | 58° | 68° | — | — |
| 2012 | 86° | 53° | 70° | — | — |
| 2011 | 100° | 62° | 81° | — | — |
| 2010 | 80° | 55° | 68° | — | — |
| 2009 | 90° | 67° | 78° | — | — |
| 2008 | 78° | 55° | 67° | — | — |
| 2007 | 71° | 51° | 61° | — | — |
| 2006 | 85° | 63° | 74° | — | — |
| 2005 | 78° | 52° | 65° | — | — |
| 2004 | 71° | 48° | 60° | — | — |
| 2003 | 90° | 60° | 75° | — | — |
| 2002 | 94° | 63° | 78° | — | — |
| 2001 | 85° | 54° | 69° | — | — |
| 2000 | 98° | 64° | 81° | — | — |
| 1999 | 78° | 55° | 67° | — | — |
| 1998 | 83° | 61° | 72° | — | — |
| 1997 | 85° | 66° | 75° | — | — |
| 1996 | 87° | 58° | 72° | — | — |
| 1995 | 98° | 65° | 81° | — | — |
| 1994 | 88° | 57° | 72° | — | — |
| 1993 | 82° | 49° | 65° | — | — |
| 1992 | 93° | 57° | 75° | — | — |
| 1991 | 85° | 54° | 69° | — | — |
| 1990 | 90° | 62° | 76° | — | — |
| 1989 | 76° | 53° | 64° | — | — |
| 1988 | 86° | 58° | 72° | — | — |
| 1987 | 88° | 55° | 71° | — | — |
| 1986 | 70° | 50° | 60° | — | — |
| 1985 | 85° | 52° | 68° | — | — |
| 1984 | 95° | 61° | 78° | — | — |
| 1983 | 90° | 67° | 78° | — | — |
| 1982 | 76° | 51° | 63° | — | — |
| 1981 | 89° | 54° | 71° | — | — |
| 1980 | 80° | 48° | 64° | — | — |
| 1979 | 88° | 52° | 70° | — | — |
| 1978 | 79° | 46° | 62° | — | — |
| 1977 | 73° | 52° | 62° | 0.18" | — |
| 1976 | 80° | 54° | 67° | — | — |
| 1975 | 83° | 52° | 67° | — | — |
| 1974 | 86° | 57° | 72° | — | — |
| 1973 | 82° | 64° | 73° | — | — |
| 1972 | 76° | 56° | 66° | — | — |
| 1971 | 89° | 60° | 75° | — | — |
Antioch, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Antioch, CA Monthly Precipitation
Average rainfall per month, in inches.
Antioch, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Antioch, CA
Antioch, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.