Weather on September 8
Simi Valley, CA
55 Years of Data
Avg High
88°F
Avg Low
64°F
Warmest
2024
96°F avg
Coldest
2010
61°F avg
About This Date
September 8th in Simi Valley, CA typically brings warm fall weather, with average highs around 88°F and lows near 64°F. Over 30 years of records, the warmest September 8th was in 2024 (96°F average), while the coldest was 2010 (61°F) — a 35°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
Planning for September 8th in Simi Valley, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
3.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 64° | 78° | — | — |
| 2024warmest | 106° | 86° | 96° | — | — |
| 2023 | 95° | 69° | 82° | — | — |
| 2022 | 93° | 80° | 87° | — | — |
| 2021 | 94° | 67° | 80° | — | — |
| 2020 | 79° | 63° | 71° | — | — |
| 2019 | 88° | 60° | 74° | — | — |
| 2018 | 101° | 70° | 85° | — | — |
| 2017 | 90° | 62° | 76° | — | — |
| 2016 | 81° | 57° | 69° | — | — |
| 2015 | 101° | 76° | 88° | — | — |
| 2014 | 87° | 67° | 77° | — | — |
| 2013 | 97° | 71° | 84° | — | — |
| 2012 | 86° | 63° | 74° | — | — |
| 2011 | 91° | 61° | 76° | — | — |
| 2010coldest | 65° | 58° | 61° | — | — |
| 2009 | 80° | 61° | 70° | — | — |
| 2008 | 79° | 57° | 68° | — | — |
| 2007 | 77° | 55° | 66° | — | — |
| 2006 | 79° | 57° | 68° | — | — |
| 2005 | 73° | 54° | 63° | — | — |
| 2004 | 95° | 68° | 82° | — | — |
| 2003 | 77° | 57° | 67° | — | — |
| 2002 | 86° | 57° | 72° | — | — |
| 2001 | 78° | 56° | 67° | — | — |
| 2000 | 92° | 66° | 79° | — | — |
| 1999 | 88° | 64° | 76° | — | — |
| 1998 | 93° | 61° | 77° | — | — |
| 1997 | 97° | 67° | 82° | — | — |
| 1996 | 98° | 69° | 84° | — | — |
30 years of data from SIMI VALLEY CALIFORNIA