Weather on May 21
Antioch, CA
55 Years of Data
Avg High
79°F
Avg Low
54°F
Warmest
2001
85°F avg
Coldest
2002
55°F avg
About This Date
May 21st in Antioch, CA typically brings pleasant spring weather, with average highs around 79°F and lows near 54°F — a 25°F daily swing. Over 55 years of records, the warmest May 21st was in 2001 (85°F average), while the coldest was 2002 (55°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 2% of May 21st dates historically. The last decade has been 1.5°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.5°F cooler on this date compared to 20-30 years ago.
Planning for May 21st in Antioch, CA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 57° | 70° | — | — |
| 2024 | 80° | 58° | 69° | — | — |
| 2023 | 77° | 59° | 68° | — | — |
| 2022 | 81° | 59° | 70° | — | — |
| 2021 | 74° | 54° | 64° | — | — |
| 2020 | 83° | 56° | 69° | — | — |
| 2019 | 65° | 53° | 59° | 0.08" | — |
| 2018 | 82° | 52° | 67° | — | — |
| 2017 | 89° | 69° | 79° | — | — |
| 2016 | 67° | 50° | 58° | — | — |
| 2015 | 73° | 52° | 62° | — | — |
| 2014 | 81° | 53° | 67° | — | — |
| 2013 | 78° | 56° | 67° | — | — |
| 2012 | 67° | 54° | 60° | — | — |
| 2011 | 82° | 53° | 68° | — | — |
| 2010 | 65° | 46° | 55° | — | — |
| 2009 | 85° | 52° | 68° | — | — |
| 2008 | 81° | 57° | 69° | — | — |
| 2007 | 86° | 57° | 72° | — | — |
| 2006 | 70° | 54° | 62° | — | — |
| 2005 | 83° | 66° | 74° | — | — |
| 2004 | 74° | 53° | 63° | — | — |
| 2003 | 86° | 66° | 76° | — | — |
| 2002coldest | 65° | 46° | 55° | — | — |
| 2001warmest | 97° | 74° | 85° | — | — |
| 2000 | 99° | 63° | 81° | — | — |
| 1999 | 85° | 48° | 66° | — | — |
| 1998 | 69° | 49° | 59° | — | — |
| 1997 | 80° | 52° | 66° | — | — |
| 1996 | 75° | 52° | 63° | — | — |
| 1995 | 77° | 50° | 64° | — | — |
| 1994 | 73° | 52° | 62° | — | — |
| 1993 | 76° | 53° | 64° | — | — |
| 1992 | 80° | 59° | 70° | — | — |
| 1991 | 75° | 55° | 65° | — | — |
| 1990 | 70° | 52° | 61° | — | — |
| 1989 | 78° | 47° | 62° | — | — |
| 1988 | 94° | 62° | 78° | — | — |
| 1987 | 74° | 50° | 62° | — | — |
| 1986 | 75° | 50° | 63° | — | — |
| 1985 | — | 50° | — | — | — |
| 1984 | 86° | 54° | 70° | — | — |
| 1983 | 94° | 54° | 74° | — | — |
| 1982 | 85° | 46° | 65° | — | — |
| 1981 | 75° | 51° | 63° | — | — |
| 1980 | 96° | 56° | 76° | — | — |
| 1979 | 76° | 57° | 66° | — | — |
| 1978 | 87° | 50° | 69° | — | — |
| 1977 | 84° | 52° | 68° | — | — |
| 1976 | 85° | 52° | 68° | — | — |
| 1975 | 73° | 53° | 63° | — | — |
| 1974 | 74° | 43° | 58° | — | — |
| 1973 | 76° | 47° | 61° | — | — |
| 1972 | 64° | 49° | 56° | — | — |
| 1971 | 77° | 48° | 63° | — | — |
55 years of data from ANTIOCH FIBREBRD MILLS