Climate almanac
Simi Valley
California, United States · 34.27°, -118.78°
What is the weather like in Simi Valley in December?
In December, Simi Valley is typically 66°F (19°C) during the day and 47°F (8°C) at night. The month brings about 3.2 in (82 mm) of precipitation in total.
- Average high66°F (19°C)
- Average low47°F (8°C)
- Precipitation3.2 in (82 mm)
- Clear or mostly clear days14
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)