Weather on March 21
Vallejo, CA
55 Years of Data
Avg High
67°F
Avg Low
45°F
Warmest
2026
70°F avg
Coldest
2006
48°F avg
About This Date
March 21st in Vallejo, CA typically brings mild spring weather, with average highs around 67°F and lows near 45°F. Over 36 years of records, the warmest March 21st was in 2026 (70°F average), while the coldest was 2006 (48°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 17% of March 21st dates historically, with the wettest March 21st recording 3.33" of rain. The last decade has been 1.9°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.9°F cooler on this date compared to 20-30 years ago.
Planning for March 21st in Vallejo, CA? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 83° | 57° | 70° | — | — |
| 2025 | 66° | 42° | 54° | — | — |
| 2024 | 69° | 48° | 59° | — | — |
| 2023 | 58° | 44° | 51° | 2.06" | — |
| 2022 | 76° | 44° | 60° | — | — |
| 2021 | 70° | 40° | 55° | — | — |
| 2020 | 66° | 43° | 54° | — | — |
| 2019 | 66° | 40° | 53° | — | — |
| 2018 | 65° | 50° | 57° | 2.39" | — |
| 2017 | 67° | 55° | 61° | 3.33" | — |
| 2016 | 65° | 50° | 57° | 0.2" | — |
| 2015 | 77° | 54° | 65° | — | — |
| 2014 | 64° | 39° | 52° | — | — |
| 2013 | 65° | 35° | 50° | — | — |
| 2012 | 69° | 42° | 56° | — | — |
| 2011 | 59° | 37° | 48° | — | — |
| 2010 | 66° | 36° | 51° | — | — |
| 2009 | 57° | 46° | 52° | — | — |
| 2008 | 66° | 31° | 48° | — | — |
| 2007 | 72° | 39° | 55° | — | — |
| 2006coldest | 56° | 40° | 48° | — | — |
| 2005 | — | 60° | — | — | — |
| 2004 | 70° | 51° | 60° | — | — |
| 2003 | 70° | 42° | 56° | — | — |
| 2002 | 68° | 44° | 56° | — | — |
| 2001 | 79° | 51° | 65° | — | — |
| 2000 | 80° | 53° | 67° | — | — |
| 1999 | 61° | 46° | 53° | — | — |
| 1998 | 62° | 53° | 58° | 0.36" | — |
| 1977 | 68° | 43° | 55° | — | — |
| 1976 | 65° | 39° | 52° | — | — |
| 1975 | 56° | 43° | 49° | — | — |
| 1974 | 64° | 46° | 55° | — | — |
| 1973 | 54° | 44° | 49° | 0.25" | — |
| 1972 | 65° | 48° | 56° | — | — |
| 1971 | 65° | 48° | 56° | — | — |
36 years of data from MARE ISLAND