Click on a day for an hourly weather forecast
The temperatures in Simi Valley in October are comfortable with low of 14°C and and high up to 23°C.
The wather in Simi Valley in October can vary between cold and nice weather days. Expect a few rainy days but usually not more than 3.
Our weather forecast can give you a great sense of what weather to expect in Simi Valley in October 2025.
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 |