Weather on May 15
Simi Valley, CA
55 Years of Data
Avg High
78°F
Avg Low
56°F
Warmest
2006
142°F avg
Coldest
2011
52°F avg
About This Date
May 15th 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 15th was in 2006 (142°F average), while the coldest was 2011 (52°F) — a 90°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
Planning for May 15th in Simi Valley, CA? Great weather for outdoor activities.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 79° | 50° | 64° | — | — |
| 2024 | 70° | 51° | 60° | — | — |
| 2023 | 84° | 55° | 70° | — | — |
| 2022 | 91° | 62° | 77° | — | — |
| 2021 | 72° | 51° | 61° | — | — |
| 2020 | 85° | 61° | 73° | — | — |
| 2019 | 72° | 52° | 62° | — | — |
| 2018 | 74° | 49° | 61° | — | — |
| 2017 | 66° | 46° | 56° | — | — |
| 2016 | 69° | 54° | 61° | — | — |
| 2015 | 62° | 47° | 54° | — | — |
| 2014 | 100° | 76° | 88° | — | — |
| 2013 | 80° | 54° | 67° | — | — |
| 2012 | 75° | 48° | 62° | — | — |
| 2011coldest | 57° | 46° | 52° | — | — |
| 2010 | 74° | 49° | 61° | — | — |
| 2009 | 77° | 55° | 66° | — | — |
| 2008 | 95° | 59° | 77° | — | — |
| 2007 | 66° | 46° | 56° | — | — |
| 2006warmest | 145° | 138° | 142° | — | — |
| 2005 | 81° | 59° | 70° | — | — |
| 2004 | 77° | 55° | 66° | — | — |
| 2003 | 68° | 48° | 58° | — | — |
| 2002 | 66° | 48° | 57° | — | — |
| 2001 | 76° | 52° | 64° | — | — |
| 2000 | 65° | 49° | 57° | — | — |
| 1999 | 72° | 49° | 60° | — | — |
| 1998 | 75° | 49° | 62° | — | — |
| 1997 | 92° | 58° | 75° | — | — |
| 1996 | 66° | 57° | 62° | — | — |
30 years of data from SIMI VALLEY CALIFORNIA