Weather on April 18
Simi Valley, CA
55 Years of Data
Avg High
72°F
Avg Low
52°F
Warmest
1999
78°F avg
Coldest
2000
50°F avg
About This Date
April 18th in Simi Valley, CA typically brings pleasant spring weather, with average highs around 72°F and lows near 52°F. Over 30 years of records, the warmest April 18th was in 1999 (78°F average), while the coldest was 2000 (50°F) — a 28°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
Planning for April 18th in Simi Valley, CA? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 60° | 46° | 53° | — | — |
| 2024 | 76° | 52° | 64° | — | — |
| 2023 | 64° | 47° | 55° | — | — |
| 2022 | 78° | 54° | 66° | — | — |
| 2021 | 82° | 64° | 73° | — | — |
| 2020 | 61° | 49° | 55° | — | — |
| 2019 | 90° | 58° | 74° | — | — |
| 2018 | 73° | 43° | 58° | — | — |
| 2017 | 69° | 53° | 61° | — | — |
| 2016 | 89° | 64° | 77° | — | — |
| 2015 | 83° | 59° | 71° | — | — |
| 2014 | 73° | 52° | 62° | — | — |
| 2013 | 76° | 56° | 66° | — | — |
| 2012 | 75° | 52° | 63° | — | — |
| 2011 | 61° | 54° | 57° | — | — |
| 2010 | 77° | 51° | 64° | — | — |
| 2009 | 81° | 52° | 66° | — | — |
| 2008 | 77° | 46° | 62° | — | — |
| 2007 | 63° | 48° | 55° | — | — |
| 2006 | 73° | 54° | 63° | — | — |
| 2005 | 59° | 50° | 55° | — | — |
| 2004 | 61° | 45° | 53° | — | — |
| 2003 | 63° | 46° | 54° | — | — |
| 2002 | 61° | 46° | 53° | — | — |
| 2001 | 73° | 47° | 60° | — | — |
| 2000coldest | 58° | 43° | 50° | — | — |
| 1999warmest | 89° | 66° | 78° | — | — |
| 1998 | 80° | 55° | 68° | — | — |
| 1997 | 77° | 51° | 64° | — | — |
| 1996 | 69° | 51° | 60° | — | — |
30 years of data from SIMI VALLEY CALIFORNIA