Weather on August 20
Simi Valley, CA
55 Years of Data
Avg High
87°F
Avg Low
62°F
Warmest
2020
88°F avg
Coldest
2002
63°F avg
About This Date
August 20th in Simi Valley, CA typically brings warm summer weather, with average highs around 87°F and lows near 62°F — a 25°F daily swing. Over 30 years of records, the warmest August 20th was in 2020 (88°F average), while the coldest was 2002 (63°F) — a 25°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 5.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.1°F warmer on this date compared to 20-30 years ago.
Planning for August 20th 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 | 96° | 69° | 83° | — | — |
| 2024 | 101° | 76° | 88° | — | — |
| 2023 | 76° | 64° | 70° | — | — |
| 2022 | 90° | 63° | 76° | — | — |
| 2021 | 82° | 59° | 71° | — | — |
| 2020warmest | 105° | 71° | 88° | — | — |
| 2019 | 95° | 64° | 80° | — | — |
| 2018 | 92° | 64° | 78° | — | — |
| 2017 | 87° | 57° | 72° | — | — |
| 2016 | 89° | 64° | 77° | — | — |
| 2015 | 84° | 59° | 72° | — | — |
| 2014 | 87° | 61° | 74° | — | — |
| 2013 | 95° | 63° | 79° | — | — |
| 2012 | 88° | 68° | 78° | — | — |
| 2011 | 77° | 55° | 66° | — | — |
| 2010 | 84° | 60° | 72° | — | — |
| 2009 | 76° | 53° | 64° | — | — |
| 2008 | 79° | 59° | 69° | — | — |
| 2007 | 90° | 63° | 76° | — | — |
| 2006 | 79° | 55° | 67° | — | — |
| 2005 | 79° | 55° | 67° | — | — |
| 2004 | 75° | 55° | 65° | — | — |
| 2003 | 82° | 61° | 71° | — | — |
| 2002coldest | 68° | 57° | 63° | — | — |
| 2001 | 92° | 62° | 77° | — | — |
| 2000 | 88° | 66° | 77° | — | — |
| 1999 | 97° | 63° | 80° | — | — |
| 1998 | 92° | 63° | 77° | — | — |
| 1997 | 92° | 64° | 78° | — | — |
| 1996 | 95° | 59° | 77° | — | — |
30 years of data from SIMI VALLEY CALIFORNIA