Weather on December 9
Simi Valley, CA
55 Years of Data
Avg High
66°F
Avg Low
50°F
Warmest
2017
73°F avg
Coldest
2013
44°F avg
About This Date
December 9th in Simi Valley, CA typically brings mild winter weather, with average highs around 66°F and lows near 50°F. Over 31 years of records, the warmest December 9th was in 2017 (73°F average), while the coldest was 2013 (44°F) — a 29°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.5°F warmer on this date compared to 20-30 years ago.
Planning for December 9th in Simi Valley, CA? Great weather for outdoor activities.
Warming Trend
2.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 79° | 64° | 71° | — | — |
| 2024 | 70° | 40° | 55° | — | — |
| 2023 | 61° | 54° | 57° | — | — |
| 2022 | 63° | 45° | 54° | — | — |
| 2021 | 51° | 46° | 49° | — | — |
| 2020 | 77° | 52° | 64° | — | — |
| 2019 | 68° | 49° | 58° | — | — |
| 2018 | 66° | 54° | 60° | — | — |
| 2017warmest | 78° | 68° | 73° | — | — |
| 2016 | 62° | 50° | 56° | — | — |
| 2015 | 82° | 62° | 72° | — | — |
| 2014 | 77° | 60° | 69° | — | — |
| 2013coldest | 51° | 38° | 44° | — | — |
| 2012 | 73° | 46° | 60° | — | — |
| 2011 | 72° | 57° | 64° | — | — |
| 2010 | 71° | 49° | 60° | — | — |
| 2009 | 54° | 38° | 46° | — | — |
| 2008 | 66° | 55° | 61° | — | — |
| 2007 | 59° | 46° | 53° | — | — |
| 2006 | 63° | 48° | 55° | — | — |
| 2005 | 68° | 54° | 61° | — | — |
| 2004 | 68° | 45° | 56° | — | — |
| 2003 | 68° | 45° | 56° | — | — |
| 2002 | 64° | 46° | 55° | — | — |
| 2001 | 59° | 45° | 52° | — | — |
| 2000 | 59° | 49° | 54° | — | — |
| 1999 | 65° | 45° | 55° | — | — |
| 1998 | 58° | 49° | 53° | — | — |
| 1997 | 55° | 41° | 48° | — | — |
| 1996 | 55° | 49° | 52° | — | — |
| 1995 | 76° | 59° | 67° | — | — |
31 years of data from SIMI VALLEY CALIFORNIA