Weather on October 20
Simi Valley, CA
55 Years of Data
Avg High
80°F
Avg Low
59°F
Warmest
1999
82°F avg
Coldest
2004
57°F avg
About This Date
October 20th in Simi Valley, CA typically brings warm fall weather, with average highs around 80°F and lows near 59°F. Over 31 years of records, the warmest October 20th was in 1999 (82°F average), while the coldest was 2004 (57°F) — a 25°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 6.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.6°F warmer on this date compared to 20-30 years ago.
Planning for October 20th in Simi Valley, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
2.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 86° | 63° | 74° | — | — |
| 2024 | 83° | 64° | 73° | — | — |
| 2023 | 91° | 70° | 80° | — | — |
| 2022 | 91° | 69° | 80° | — | — |
| 2021 | 75° | 52° | 63° | — | — |
| 2020 | 86° | 57° | 72° | — | — |
| 2019 | 82° | 64° | 73° | — | — |
| 2018 | 87° | 67° | 77° | — | — |
| 2017 | 71° | 55° | 63° | — | — |
| 2016 | 89° | 72° | 80° | — | — |
| 2015 | 81° | 60° | 70° | — | — |
| 2014 | 80° | 55° | 68° | — | — |
| 2013 | 86° | 60° | 73° | — | — |
| 2012 | 66° | 59° | 63° | — | — |
| 2011 | 66° | 52° | 59° | — | — |
| 2010 | 67° | 58° | 62° | — | — |
| 2009 | 73° | 54° | 63° | — | — |
| 2008 | 73° | 50° | 62° | — | — |
| 2007 | 79° | 55° | 67° | — | — |
| 2006 | 88° | 59° | 73° | — | — |
| 2005 | 70° | 52° | 61° | — | — |
| 2004coldest | 63° | 52° | 57° | — | — |
| 2003 | 95° | 64° | 80° | — | — |
| 2002 | 70° | 48° | 59° | — | — |
| 2001 | 73° | 50° | 62° | — | — |
| 2000 | 85° | 54° | 69° | — | — |
| 1999warmest | 92° | 73° | 82° | — | — |
| 1998 | 88° | 63° | 75° | — | — |
| 1997 | 71° | 53° | 62° | — | — |
| 1996 | 73° | 50° | 62° | — | — |
| 1995 | 87° | 60° | 74° | — | — |
31 years of data from SIMI VALLEY CALIFORNIA