Weather on August 21
Antioch, CA
55 Years of Data
Avg High
86°F
Avg Low
59°F
Warmest
1992
86°F avg
Coldest
2001
62°F avg
About This Date
August 21st in Antioch, CA typically brings warm summer weather, with average highs around 86°F and lows near 59°F — a 27°F daily swing. Over 55 years of records, the warmest August 21st was in 1992 (86°F average), while the coldest was 2001 (62°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 4% of August 21st dates historically, with the wettest August 21st recording 0.89" of rain. The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Antioch, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 97° | 74° | 85° | — | — |
| 2024 | 78° | 62° | 70° | — | — |
| 2023 | 78° | 59° | 69° | — | — |
| 2022 | 83° | 67° | 75° | — | — |
| 2021 | 76° | 59° | 67° | — | — |
| 2020 | 94° | 64° | 79° | — | — |
| 2019 | 94° | 60° | 77° | — | — |
| 2018 | 76° | 57° | 66° | — | — |
| 2017 | 69° | 55° | 62° | — | — |
| 2016 | 88° | 59° | 73° | — | — |
| 2015 | 90° | 57° | 73° | — | — |
| 2014 | 85° | 59° | 72° | — | — |
| 2013 | 86° | 60° | 73° | — | — |
| 2012 | 82° | 69° | 76° | — | — |
| 2011 | 90° | 56° | 73° | — | — |
| 2010 | 86° | 53° | 70° | — | — |
| 2009 | 93° | 66° | 80° | — | — |
| 2008 | 88° | 62° | 75° | — | — |
| 2007 | 95° | 62° | 79° | — | — |
| 2006 | 88° | 55° | 71° | — | — |
| 2005 | 77° | 68° | 73° | — | — |
| 2004 | 82° | 61° | 71° | — | — |
| 2003 | 81° | 61° | 71° | 0.89" | — |
| 2002 | 86° | 53° | 70° | — | — |
| 2001coldest | 70° | 55° | 62° | — | — |
| 2000 | 90° | 58° | 74° | — | — |
| 1999 | 93° | 57° | 75° | — | — |
| 1998 | 83° | 52° | 67° | — | — |
| 1997 | 80° | 61° | 70° | 0.03" | — |
| 1996 | 84° | 60° | 72° | — | — |
| 1995 | 99° | 63° | 81° | — | — |
| 1994 | 93° | 59° | 76° | — | — |
| 1993 | 87° | 60° | 74° | — | — |
| 1992warmest | 101° | 71° | 86° | — | — |
| 1991 | 89° | 53° | 71° | — | — |
| 1990 | 86° | 58° | 72° | — | — |
| 1989 | 82° | 58° | 70° | — | — |
| 1988 | 91° | 59° | 75° | — | — |
| 1987 | 79° | 53° | 66° | — | — |
| 1986 | 89° | 51° | 70° | — | — |
| 1985 | 88° | 50° | 69° | — | — |
| 1984 | 87° | 52° | 69° | — | — |
| 1983 | 83° | 62° | 72° | — | — |
| 1982 | 94° | 59° | 76° | — | — |
| 1981 | 83° | 51° | 67° | — | — |
| 1980 | 86° | 54° | 70° | — | — |
| 1979 | 81° | 55° | 68° | — | — |
| 1978 | 97° | 55° | 76° | — | — |
| 1977 | 91° | 55° | 73° | — | — |
| 1976 | 88° | 59° | 73° | — | — |
| 1975 | 88° | 57° | 72° | — | — |
| 1974 | 94° | 54° | 74° | — | — |
| 1973 | 87° | 59° | 73° | — | — |
| 1972 | 84° | 59° | 72° | — | — |
| 1971 | 85° | 56° | 70° | — | — |
55 years of data from ANTIOCH FIBREBRD MILLS