Weather on August 28
Simi Valley, CA
55 Years of Data
Avg High
92°F
Avg Low
65°F
Warmest
1998
92°F avg
Coldest
2010
62°F avg
About This Date
August 28th in Simi Valley, CA typically brings hot summer weather, with average highs around 92°F and lows near 65°F — a 27°F daily swing. Over 30 years of records, the warmest August 28th was in 1998 (92°F average), while the coldest was 2010 (62°F) — a 30°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for August 28th in Simi Valley, CA? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 90° | 66° | 78° | — | — |
| 2024 | 90° | 58° | 74° | — | — |
| 2023 | 104° | 80° | 92° | — | — |
| 2022 | 88° | 59° | 73° | — | — |
| 2021 | 102° | 69° | 86° | — | — |
| 2020 | 98° | 65° | 81° | — | — |
| 2019 | 94° | 63° | 78° | — | — |
| 2018 | 87° | 58° | 72° | — | — |
| 2017 | 104° | 75° | 90° | — | — |
| 2016 | 89° | 60° | 75° | — | — |
| 2015 | 101° | 74° | 87° | — | — |
| 2014 | 94° | 72° | 83° | — | — |
| 2013 | 97° | 75° | 86° | — | — |
| 2012 | 90° | 66° | 78° | — | — |
| 2011 | 95° | 66° | 81° | — | — |
| 2010coldest | 71° | 53° | 62° | — | — |
| 2009 | 98° | 72° | 85° | — | — |
| 2008 | 79° | 57° | 68° | — | — |
| 2007 | 86° | 63° | 74° | — | — |
| 2006 | 88° | 61° | 74° | — | — |
| 2005 | 90° | 66° | 78° | — | — |
| 2004 | 81° | 59° | 70° | — | — |
| 2003 | 86° | 61° | 73° | — | — |
| 2002 | 81° | 57° | 69° | — | — |
| 2001 | 96° | 61° | 78° | — | — |
| 2000 | 84° | 57° | 71° | — | — |
| 1999 | 104° | 67° | 85° | — | — |
| 1998warmest | 108° | 76° | 92° | — | — |
| 1997 | 92° | 62° | 77° | — | — |
| 1996 | 104° | 69° | 87° | — | — |
30 years of data from SIMI VALLEY CALIFORNIA