Click on a day for an hourly weather forecast
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 16° / 8° | 3 | 28 | 0 | 81 mm | Good | Simi Valley in January |
| February | 16° / 8° | 3 | 26 | 0 | 69 mm | Good | Simi Valley in February |
| March | 17° / 9° | 2 | 29 | 0 | 52 mm | Good | Simi Valley in March |
| April | 19° / 11° | 1 | 29 | 0 | 24 mm | Good | Simi Valley in April |
| May | 21° / 14° | 1 | 30 | 0 | 14 mm | Good | Simi Valley in May |
| June | 24° / 17° | 0 | 30 | 0 | 4 mm | Perfect | Simi Valley in June |
| July | 26° / 19° | 0 | 31 | 0 | 12 mm | Perfect | Simi Valley in July |
| August | 26° / 20° | 0 | 31 | 0 | 5 mm | Perfect | Simi Valley in August |
| September | 26° / 18° | 0 | 30 | 0 | 9 mm | Perfect | Simi Valley in September |
| October | 23° / 14° | 1 | 30 | 0 | 16 mm | Perfect | Simi Valley in October |
| November | 19° / 11° | 1 | 29 | 0 | 23 mm | Good | Simi Valley in November |
| December | 15° / 8° | 3 | 28 | 0 | 68 mm | Good | Simi Valley in December |