Simi Valley in December
7.8out of 10
Yes, a good time to go
Mild: highs around 18°C. Some rain: about 4 rainy days.
18°CAvg high
7°CAvg low
4Rainy days (58 mm)
9:43 hDaylight
07:00Sunrise · 16:43 Sunset
Why this score
- Mild: highs around 18°C
- Some rain: about 4 rainy days
What to wear and pack
- Layers you can add or remove
- Comfortable walking shoes
How reliable is the forecast?
Rainfall in December is fairly consistent from year to year (2.9 days). Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 18°C | 7°C | 91 mm | 6 | – | – | 7.6 |
| February | 18°C | 7°C | 97 mm | 6 | – | – | 7.5 |
| March | 20°C | 9°C | 66 mm | 6 | – | – | 7.9 |
| April | 21°C | 10°C | 23 mm | 3 | – | – | 8.6 |
| May | 23°C | 12°C | 12 mm | 2 | – | – | 8.8 |
| June | 26°C | 15°C | 2 mm | 0 | – | – | 9.0 |
| July | 28°C | 18°C | 3 mm | 0 | – | – | 9.0 |
| August | 29°C | 18°C | 0 mm | 0 | – | – | 9.0 |
| September | 28°C | 17°C | 4 mm | 1 | – | – | 9.0 |
| October | 25°C | 14°C | 19 mm | 2 | – | – | 8.8 |
| November | 21°C | 10°C | 22 mm | 3 | – | – | 8.6 |
| December | 18°C | 7°C | 58 mm | 4 | – | – | 7.8 |
Frequently asked questions
How hot is Simi Valley in December?
Daytime highs average 18°C and nights about 7°C.
When is the best time to visit Simi Valley?
The best months are June, July, August, September.