Weather on October 18
Simi Valley, CA
55 Years of Data
Avg High
80°F
Avg Low
56°F
Warmest
2023
81°F avg
Coldest
2005
12°F avg
About This Date
October 18th in Simi Valley, CA typically brings warm fall weather, with average highs around 80°F and lows near 56°F. Over 31 years of records, the warmest October 18th was in 2023 (81°F average), while the coldest was 2005 (12°F) — a 69°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 9.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 9.5°F warmer on this date compared to 20-30 years ago.
Planning for October 18th in Simi Valley, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
2.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 85° | 64° | 74° | — | — |
| 2024 | 75° | 55° | 65° | — | — |
| 2023warmest | 94° | 68° | 81° | — | — |
| 2022 | 92° | 65° | 78° | — | — |
| 2021 | 66° | 50° | 58° | — | — |
| 2020 | 91° | 64° | 78° | — | — |
| 2019 | 84° | 57° | 71° | — | — |
| 2018 | 83° | 67° | 75° | — | — |
| 2017 | 88° | 64° | 76° | — | — |
| 2016 | 78° | 58° | 68° | — | — |
| 2015 | 78° | 60° | 69° | — | — |
| 2014 | 79° | 58° | 68° | — | — |
| 2013 | 92° | 62° | 77° | — | — |
| 2012 | 84° | 63° | 73° | — | — |
| 2011 | 75° | 52° | 63° | — | — |
| 2010 | 62° | 57° | 60° | — | — |
| 2009 | 88° | 57° | 72° | — | — |
| 2008 | 77° | 54° | 65° | — | — |
| 2007 | 82° | 54° | 68° | — | — |
| 2006 | 79° | 63° | 71° | — | — |
| 2005coldest | 64° | -40° | 12° | — | — |
| 2004 | 61° | 55° | 58° | — | — |
| 2003 | 95° | 64° | 80° | — | — |
| 2002 | 66° | 50° | 58° | — | — |
| 2001 | 75° | 52° | 63° | — | — |
| 2000 | 77° | 57° | 67° | — | — |
| 1999 | 88° | 65° | 76° | — | — |
| 1998 | 83° | 61° | 72° | — | — |
| 1997 | 91° | 61° | 76° | — | — |
| 1996 | 81° | 54° | 67° | — | — |
| 1995 | 80° | 58° | 69° | — | — |
31 years of data from SIMI VALLEY CALIFORNIA