Weather on May 20
Simi Valley, CA
55 Years of Data
Avg High
78°F
Avg Low
56°F
Warmest
2006
144°F avg
Coldest
2002
55°F avg
About This Date
May 20th in Simi Valley, CA typically brings pleasant spring weather, with average highs around 78°F and lows near 56°F. Over 30 years of records, the warmest May 20th was in 2006 (144°F average), while the coldest was 2002 (55°F) — a 89°F range across recorded history. This date has historically been dry, with little recorded precipitation. 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 20th in Simi Valley, CA? Great weather for outdoor activities.
Cooling Trend
1.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 93° | 67° | 80° | — | — |
| 2024 | 68° | 48° | 58° | — | — |
| 2023 | 85° | 55° | 70° | — | — |
| 2022 | 64° | 52° | 58° | — | — |
| 2021 | 69° | 50° | 60° | — | — |
| 2020 | 76° | 49° | 62° | — | — |
| 2019 | 68° | 47° | 57° | — | — |
| 2018 | 67° | 54° | 60° | — | — |
| 2017 | 94° | 65° | 79° | — | — |
| 2016 | 65° | 49° | 57° | — | — |
| 2015 | 73° | 51° | 62° | — | — |
| 2014 | 68° | 48° | 58° | — | — |
| 2013 | 93° | 56° | 74° | — | — |
| 2012 | 82° | 54° | 68° | — | — |
| 2011 | 66° | 50° | 58° | — | — |
| 2010 | 80° | 56° | 68° | — | — |
| 2009 | 77° | 54° | 65° | — | — |
| 2008 | 72° | 52° | 62° | — | — |
| 2007 | 68° | 48° | 58° | — | — |
| 2006warmest | 147° | 140° | 144° | — | — |
| 2005 | 82° | 57° | 70° | — | — |
| 2004 | 68° | 52° | 60° | — | — |
| 2003 | 86° | 59° | 73° | — | — |
| 2002coldest | 61° | 50° | 55° | — | — |
| 2001 | 78° | 54° | 66° | — | — |
| 2000 | 98° | 69° | 84° | — | — |
| 1999 | 66° | 49° | 57° | — | — |
| 1998 | 72° | 49° | 60° | — | — |
| 1997 | 77° | 56° | 66° | — | — |
| 1996 | 77° | 53° | 65° | — | — |
30 years of data from SIMI VALLEY CALIFORNIA