Weather on September 5
Simi Valley, CA
55 Years of Data
About This Date
September 5th in Simi Valley, CA typically brings hot fall weather, with average highs around 91°F and lows near 66°F — a 25°F daily swing. Over 30 years of records, the warmest September 5th was in 2020 (102°F average), while the coldest was 2023 (66°F) — a 36°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 6.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.9°F warmer on this date compared to 20-30 years ago.
Planning for September 5th in Simi Valley, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 97° | 64° | 80° | — | — |
| 2024 | 109° | 89° | 99° | — | — |
| 2023coldest | 74° | 58° | 66° | — | — |
| 2022 | 109° | 76° | 92° | — | — |
| 2021 | 107° | 76° | 91° | — | — |
| 2020warmest | 116° | 87° | 102° | — | — |
| 2019 | 102° | 75° | 89° | — | — |
| 2018 | 85° | 59° | 72° | — | — |
| 2017 | 89° | 65° | 77° | — | — |
| 2016 | 78° | 56° | 67° | — | — |
| 2015 | 85° | 58° | 71° | — | — |
| 2014 | 95° | 60° | 78° | — | — |
| 2013 | 102° | 77° | 90° | — | — |
| 2012 | 77° | 66° | 72° | — | — |
| 2011 | 93° | 59° | 76° | — | — |
| 2010 | 83° | 58° | 70° | — | — |
| 2009 | 84° | 64° | 74° | — | — |
| 2008 | 88° | 64° | 76° | — | — |
| 2007 | 84° | 57° | 71° | — | — |
| 2006 | 91° | 70° | 80° | — | — |
| 2005 | 84° | 59° | 72° | — | — |
| 2004 | 97° | 70° | 83° | — | — |
| 2003 | 93° | 66° | 80° | — | — |
| 2002 | 83° | 69° | 76° | — | — |
| 2001 | 92° | 63° | 77° | — | — |
| 2000 | 86° | 63° | 74° | — | — |
| 1999 | 89° | 56° | 72° | — | — |
| 1998 | 79° | 66° | 72° | — | — |
| 1997 | 97° | 71° | 84° | — | — |
| 1996 | 93° | 59° | 76° | — | — |
Simi Valley, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Simi Valley, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Simi Valley, CA
Most pleasant months in Simi Valley, CA: January, March, April, May, June, October, November.