Weather on September 3
Simi Valley, CA
55 Years of Data
Avg High
90°F
Avg Low
63°F
Warmest
2022
91°F avg
Coldest
2005
65°F avg
About This Date
September 3rd in Simi Valley, CA typically brings hot fall weather, with average highs around 90°F and lows near 63°F — a 27°F daily swing. Over 29 years of records, the warmest September 3rd was in 2022 (91°F average), while the coldest was 2005 (65°F) — a 26°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 5.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.6°F warmer on this date compared to 20-30 years ago.
Planning for September 3rd in Simi Valley, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
2.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 99° | 71° | 85° | — | — |
| 2024 | 98° | 69° | 84° | — | — |
| 2023 | 78° | 60° | 69° | — | — |
| 2022warmest | 107° | 76° | 91° | — | — |
| 2021 | 90° | 59° | 74° | — | — |
| 2020 | 93° | 61° | 77° | — | — |
| 2019 | 99° | 73° | 86° | — | — |
| 2018 | 84° | 62° | 73° | — | — |
| 2017 | 99° | 68° | 83° | — | — |
| 2016 | 80° | 55° | 68° | — | — |
| 2015 | 81° | 58° | 69° | — | — |
| 2014 | 88° | 61° | 74° | — | — |
| 2013 | 98° | 73° | 86° | — | — |
| 2012 | 84° | 59° | 72° | — | — |
| 2011 | 79° | 52° | 65° | — | — |
| 2010 | 89° | 56° | 72° | — | — |
| 2009 | 95° | 71° | 83° | — | — |
| 2008 | 90° | 57° | 73° | — | — |
| 2007 | 99° | 77° | 88° | — | — |
| 2006 | 93° | 66° | 80° | — | — |
| 2005coldest | 79° | 52° | 65° | — | — |
| 2004 | 77° | 59° | 68° | — | — |
| 2003 | 82° | 59° | 71° | — | — |
| 2002 | 108° | 70° | 89° | — | — |
| 2001 | 85° | 62° | 73° | — | — |
| 2000 | 80° | 56° | 68° | — | — |
| 1999 | 80° | 54° | 67° | — | — |
| 1998 | 101° | 71° | 86° | — | — |
| 1996 | 91° | 57° | 74° | — | — |
29 years of data from SIMI VALLEY CALIFORNIA