Weather on August 9
Simi Valley, CA
55 Years of Data
Avg High
89°F
Avg Low
62°F
Warmest
1998
89°F avg
Coldest
2010
65°F avg
About This Date
August 9th 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 9th was in 1998 (89°F average), while the coldest was 2010 (65°F) — a 24°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
Planning for August 9th in Simi Valley, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 98° | 66° | 82° | — | — |
| 2024 | 95° | 63° | 79° | — | — |
| 2023 | 86° | 64° | 75° | — | — |
| 2022 | 98° | 73° | 86° | — | — |
| 2021 | 95° | 59° | 77° | — | — |
| 2020 | 94° | 61° | 77° | — | — |
| 2019 | 92° | 62° | 77° | — | — |
| 2018 | 107° | 70° | 88° | — | — |
| 2017 | 96° | 65° | 80° | — | — |
| 2016 | 87° | 59° | 73° | — | — |
| 2015 | 84° | 58° | 71° | — | — |
| 2014 | 90° | 59° | 74° | — | — |
| 2013 | 86° | 55° | 71° | — | — |
| 2012 | 93° | 66° | 80° | — | — |
| 2011 | 77° | 54° | 65° | — | — |
| 2010coldest | 76° | 54° | 65° | — | — |
| 2009 | 80° | 57° | 69° | — | — |
| 2008 | 82° | 59° | 71° | — | — |
| 2007 | 81° | 57° | 69° | — | — |
| 2006 | 90° | 63° | 76° | — | — |
| 2005 | 84° | 59° | 72° | — | — |
| 2004 | 86° | 63° | 74° | — | — |
| 2003 | 91° | 66° | 79° | — | — |
| 2002 | 86° | 61° | 73° | — | — |
| 2001 | 79° | 55° | 67° | — | — |
| 2000 | 92° | 70° | 81° | — | — |
| 1999 | 84° | 57° | 71° | — | — |
| 1998warmest | 103° | 76° | 89° | — | — |
| 1997 | 87° | 59° | 73° | — | — |
| 1996 | 105° | 62° | 84° | — | — |
30 years of data from SIMI VALLEY CALIFORNIA