Weather on August 23
Simi Valley, CA
55 Years of Data
Avg High
89°F
Avg Low
62°F
Warmest
1998
89°F avg
Coldest
2004
64°F avg
About This Date
August 23rd in Simi Valley, CA typically brings warm summer weather, with average highs around 89°F and lows near 62°F — a 27°F daily swing. Over 30 years of records, the warmest August 23rd was in 1998 (89°F average), while the coldest was 2004 (64°F) — a 25°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
Planning for August 23rd in Simi Valley, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 101° | 70° | 85° | — | — |
| 2024 | 85° | 57° | 71° | — | — |
| 2023 | 91° | 68° | 80° | — | — |
| 2022 | 98° | 66° | 82° | — | — |
| 2021 | 83° | 58° | 70° | — | — |
| 2020 | 93° | 69° | 81° | — | — |
| 2019 | 86° | 60° | 73° | — | — |
| 2018 | 90° | 62° | 76° | — | — |
| 2017 | 86° | 59° | 73° | — | — |
| 2016 | 91° | 65° | 78° | — | — |
| 2015 | 93° | 64° | 79° | — | — |
| 2014 | 88° | 58° | 73° | — | — |
| 2013 | 100° | 67° | 83° | — | — |
| 2012 | 75° | 57° | 66° | — | — |
| 2011 | 86° | 59° | 73° | — | — |
| 2010 | 92° | 67° | 79° | — | — |
| 2009 | 81° | 62° | 71° | — | — |
| 2008 | 75° | 59° | 67° | — | — |
| 2007 | 79° | 59° | 69° | — | — |
| 2006 | 91° | 63° | 77° | — | — |
| 2005 | 82° | 54° | 68° | — | — |
| 2004coldest | 73° | 55° | 64° | — | — |
| 2003 | 82° | 59° | 71° | — | — |
| 2002 | 77° | 55° | 66° | — | — |
| 2001 | 81° | 57° | 69° | — | — |
| 2000 | 94° | 57° | 75° | — | — |
| 1999 | 101° | 68° | 84° | — | — |
| 1998warmest | 107° | 72° | 89° | — | — |
| 1997 | 97° | 71° | 84° | — | — |
| 1996 | 105° | 70° | 87° | — | — |
30 years of data from SIMI VALLEY CALIFORNIA