Weather on March 31
Simi Valley, CA
55 Years of Data
Avg High
68°F
Avg Low
50°F
Warmest
2011
78°F avg
Coldest
1998
45°F avg
About This Date
March 31st in Simi Valley, CA typically brings mild spring weather, with average highs around 68°F and lows near 50°F. Over 31 years of records, the warmest March 31st was in 2011 (78°F average), while the coldest was 1998 (45°F) — a 33°F range across recorded history. This date has historically been dry, with little recorded precipitation. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for March 31st in Simi Valley, CA? Great weather for outdoor activities.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 63° | 55° | 59° | — | — |
| 2025 | 62° | 47° | 54° | — | — |
| 2024 | 55° | 44° | 50° | — | — |
| 2023 | 62° | 41° | 52° | — | — |
| 2022 | 64° | 49° | 56° | — | — |
| 2021 | 81° | 64° | 72° | — | — |
| 2020 | 78° | 56° | 67° | — | — |
| 2019 | 78° | 58° | 68° | — | — |
| 2018 | 79° | 57° | 68° | — | — |
| 2017 | 68° | 48° | 58° | — | — |
| 2016 | 70° | 47° | 58° | — | — |
| 2015 | 80° | 56° | 68° | — | — |
| 2014 | 66° | 46° | 56° | — | — |
| 2013 | 67° | 48° | 57° | — | — |
| 2012 | 59° | 46° | 53° | — | — |
| 2011warmest | 91° | 64° | 78° | — | — |
| 2010 | 59° | 47° | 53° | — | — |
| 2009 | 70° | 48° | 59° | — | — |
| 2008 | 59° | 43° | 51° | — | — |
| 2007 | 73° | 48° | 61° | — | — |
| 2006 | 55° | 46° | 51° | — | — |
| 2005 | 72° | 57° | 64° | — | — |
| 2004 | 68° | 48° | 58° | — | — |
| 2003 | 84° | 59° | 72° | — | — |
| 2002 | 70° | 46° | 58° | — | — |
| 2001 | 75° | 52° | 63° | — | — |
| 2000 | 75° | 60° | 68° | — | — |
| 1999 | 51° | 42° | 47° | — | — |
| 1998coldest | 52° | 38° | 45° | — | — |
| 1997 | 66° | 48° | 57° | — | — |
| 1996 | 71° | 50° | 61° | — | — |
31 years of data from SIMI VALLEY CALIFORNIA