The temperatures in Simi Valley in December are quite cold with temperatures between 8°C and 15°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Simi Valley during the month of December. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Simi Valley in December 2024.
If you’re planning to visit Simi Valley in the near future, we highly recommend that you review the 14 day weather forecast for Simi Valley before you arrive.
Temperatures
15° / 8°
Rainy Days
3
Snowy Days
0
Dry Days
28
Rainfall
68
mm
Sun Hours
9.5
Hrs