Weather on August 21
Concord, CA
55 Years of Data
Avg High
86°F
Avg Low
58°F
Warmest
2025
81°F avg
Coldest
1987
64°F avg
About This Date
August 21st in Concord, CA typically brings warm summer weather, with average highs around 86°F and lows near 58°F — a 28°F daily swing. Over 55 years of records, the warmest August 21st was in 2025 (81°F average), while the coldest was 1987 (64°F) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 2% of August 21st dates historically. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Concord, 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 |
|---|---|---|---|---|---|
| 2025warmest | 101° | 62° | 81° | — | — |
| 2024 | 87° | 61° | 74° | — | — |
| 2023 | 81° | 66° | 73° | — | — |
| 2022 | 84° | 60° | 72° | — | — |
| 2021 | 72° | 59° | 65° | — | — |
| 2020 | 96° | 64° | 80° | — | — |
| 2019 | 94° | 62° | 78° | — | — |
| 2018 | 72° | 58° | 65° | — | — |
| 2017 | 77° | 63° | 70° | — | — |
| 2016 | 86° | 58° | 72° | — | — |
| 2015 | 83° | 60° | 71° | — | — |
| 2014 | 87° | 60° | 74° | — | — |
| 2013 | 82° | 57° | 70° | — | — |
| 2012 | 89° | 55° | 72° | — | — |
| 2011 | 81° | 59° | 70° | — | — |
| 2010 | 72° | 57° | 64° | — | — |
| 2009 | 99° | 56° | 77° | — | — |
| 2008 | 85° | 62° | 73° | — | — |
| 2007 | 97° | 62° | 79° | — | — |
| 2006 | 83° | 55° | 69° | — | — |
| 2005 | 85° | 56° | 70° | — | — |
| 2004 | 77° | 59° | 68° | — | — |
| 2003 | 77° | 63° | 70° | 0.48" | — |
| 2002 | 84° | 57° | 71° | — | — |
| 2001 | 79° | 55° | 67° | — | — |
| 2000 | 90° | 57° | 73° | — | — |
| 1999 | 95° | 59° | 77° | — | — |
| 1998 | 83° | 58° | 70° | — | — |
| 1997 | 86° | 59° | 73° | — | — |
| 1996 | 89° | 59° | 74° | — | — |
| 1995 | 92° | 59° | 75° | — | — |
| 1994 | 81° | 57° | 69° | — | — |
| 1993 | 90° | 59° | 74° | — | — |
| 1992 | 92° | 59° | 75° | — | — |
| 1991 | 84° | 53° | 69° | — | — |
| 1990 | 86° | 59° | 73° | — | — |
| 1989 | 76° | 55° | 65° | — | — |
| 1988 | 79° | 50° | 64° | — | — |
| 1987coldest | 82° | 47° | 64° | — | — |
| 1986 | 89° | 50° | 70° | — | — |
| 1985 | 85° | 56° | 70° | — | — |
| 1984 | 84° | 56° | 70° | — | — |
| 1983 | 83° | 55° | 69° | — | — |
| 1982 | 98° | 63° | 80° | — | — |
| 1981 | 92° | 59° | 75° | — | — |
| 1980 | 87° | 53° | 70° | — | — |
| 1979 | 82° | 58° | 70° | — | — |
| 1978 | 82° | 51° | 67° | — | — |
| 1977 | 92° | 51° | 71° | — | — |
| 1976 | 82° | 61° | 71° | — | — |
| 1975 | 85° | 54° | 69° | — | — |
| 1974 | 96° | 53° | 75° | — | — |
| 1973 | 85° | 56° | 70° | — | — |
| 1972 | 92° | 56° | 74° | — | — |
| 1971 | 84° | 58° | 71° | — | — |
55 years of data from CONCORD BUCHANAN FLD