Weather on January 21
Simi Valley, CA
55 Years of Data
Avg High
63°F
Avg Low
46°F
Warmest
2014
71°F avg
Coldest
2010
5°F avg
About This Date
January 21st in Simi Valley, CA typically brings mild winter weather, with average highs around 63°F and lows near 46°F. Over 31 years of records, the warmest January 21st was in 2014 (71°F average), while the coldest was 2010 (5°F) — a 66°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
Planning for January 21st in Simi Valley, CA? Great weather for outdoor activities.
Warming Trend
1.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 66° | 55° | 61° | — | — |
| 2025 | 63° | 48° | 55° | — | — |
| 2024 | 59° | 50° | 55° | — | — |
| 2023 | 60° | 45° | 52° | — | — |
| 2022 | 70° | 56° | 63° | — | — |
| 2021 | 71° | 51° | 61° | — | — |
| 2020 | 61° | 46° | 53° | — | — |
| 2019 | 57° | 47° | 52° | — | — |
| 2018 | 60° | 44° | 52° | — | — |
| 2017 | 51° | 42° | 47° | — | — |
| 2016 | 69° | 55° | 62° | — | — |
| 2015 | 68° | 47° | 57° | — | — |
| 2014warmest | 79° | 64° | 71° | — | — |
| 2013 | 76° | 60° | 68° | — | — |
| 2012 | 61° | 46° | 53° | — | — |
| 2011 | 74° | 56° | 65° | — | — |
| 2010coldest | 50° | -40° | 5° | — | — |
| 2009 | 73° | 59° | 66° | — | — |
| 2008 | 50° | 43° | 46° | — | — |
| 2007 | 61° | 39° | 50° | — | — |
| 2006 | 64° | 48° | 56° | — | — |
| 2005 | 70° | 52° | 61° | — | — |
| 2004 | 64° | 52° | 58° | — | — |
| 2003 | 63° | 50° | 56° | — | — |
| 2002 | 66° | 37° | 52° | — | — |
| 2001 | 64° | 52° | 58° | — | — |
| 2000 | 62° | 49° | 55° | — | — |
| 1999 | 63° | 48° | 55° | — | — |
| 1998 | 64° | 44° | 54° | — | — |
| 1997 | 49° | 43° | 46° | — | — |
| 1996 | 50° | 43° | 46° | — | — |
31 years of data from SIMI VALLEY CALIFORNIA