Weather on March 21
Antioch, CA
55 Years of Data
Avg High
66°F
Avg Low
46°F
Warmest
2026
70°F avg
Coldest
2023
43°F avg
About This Date
March 21st in Antioch, CA typically brings mild spring weather, with average highs around 66°F and lows near 46°F. Over 56 years of records, the warmest March 21st was in 2026 (70°F average), while the coldest was 2023 (43°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 14% of March 21st dates historically, with the wettest March 21st recording 1.73" of rain. 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 March 21st in Antioch, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 75° | 65° | 70° | — | — |
| 2025 | 57° | 44° | 51° | — | — |
| 2024 | 62° | 49° | 55° | — | — |
| 2023coldest | 46° | 39° | 43° | — | — |
| 2022 | 69° | 48° | 59° | — | — |
| 2021 | 69° | 47° | 58° | — | — |
| 2020 | 67° | 46° | 56° | — | — |
| 2019 | 64° | 44° | 54° | — | — |
| 2018 | 62° | 50° | 56° | — | — |
| 2017 | 69° | 56° | 62° | 0.86" | — |
| 2016 | 68° | 49° | 58° | 0.15" | — |
| 2015 | 75° | 56° | 65° | — | — |
| 2014 | 72° | 47° | 59° | — | — |
| 2013 | 66° | 43° | 54° | — | — |
| 2012 | 79° | 49° | 64° | — | — |
| 2011 | 49° | 40° | 44° | — | — |
| 2010 | 59° | 48° | 54° | — | — |
| 2009 | 64° | 44° | 54° | — | — |
| 2008 | 66° | 47° | 56° | — | — |
| 2007 | 68° | 49° | 58° | — | — |
| 2006 | 61° | 41° | 51° | — | — |
| 2005 | 62° | 44° | 53° | 1.73" | — |
| 2004 | 68° | 48° | 58° | — | — |
| 2003 | 69° | 47° | 58° | — | — |
| 2002 | 69° | 48° | 59° | — | — |
| 2001 | 67° | 47° | 57° | — | — |
| 2000 | 70° | 47° | 58° | — | — |
| 1999 | 65° | 44° | 54° | — | — |
| 1998 | 67° | 51° | 59° | — | — |
| 1997 | 76° | 54° | 65° | — | — |
| 1996 | 73° | 45° | 59° | — | — |
| 1995 | 57° | 43° | 50° | 1.55" | — |
| 1994 | 69° | 42° | 56° | — | — |
| 1993 | 70° | 48° | 59° | — | — |
| 1992 | 63° | 50° | 56° | — | — |
| 1991 | 56° | 43° | 49° | — | — |
| 1990 | 74° | 50° | 62° | — | — |
| 1989 | 72° | 50° | 61° | — | — |
| 1988 | 76° | 50° | 63° | — | — |
| 1987 | 59° | 41° | 50° | 0.66" | — |
| 1986 | 73° | 52° | 62° | — | — |
| 1985 | 67° | 42° | 54° | — | — |
| 1984 | 78° | 46° | 62° | — | — |
| 1983 | 56° | 41° | 48° | 0.99" | — |
| 1982 | 62° | 36° | 49° | — | — |
| 1981 | 55° | — | — | 0.74" | — |
| 1980 | 64° | — | — | — | — |
| 1979 | 66° | 41° | 54° | — | — |
| 1978 | 71° | 54° | 62° | — | — |
| 1977 | 72° | 41° | 56° | — | — |
| 1976 | 71° | 44° | 58° | — | — |
| 1975 | 58° | 41° | 49° | — | — |
| 1974 | 65° | 44° | 54° | — | — |
| 1973 | 56° | 41° | 48° | 0.36" | — |
| 1972 | 72° | 46° | 59° | — | — |
| 1971 | 74° | 42° | 58° | — | — |
56 years of data from ANTIOCH FIBREBRD MILLS