Weather in Simi Valley in December
Simi Valley, United States averages a high of 17.7°C (63.9°F) and low of 6.8°C (44.2°F) in December, with 5 rain days and 8.5 hours of daily sunshine. Travel score: 79.6/100 (Good). The best time to visit Simi Valley is August.
High
18°C64°F
Low
7°C44°F
🌧️
5
rain days
☀️
8.5
hrs/day sunshine
💧
62%
humidity
80— Good
December in Simi Valley is mild and mostly dry — good for most activities.
What are the average temperatures in Simi Valley?
How much does it rain in Simi Valley in December?
Simi Valley receives an average of 61.4mm of rainfall across 5 rainy days in December. The annual total is 375.5mm.
What should I pack for Simi Valley in December?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
🧥
Mix of light and warm layers
Mild temperatures around 18°C
Recommended
🧴
Sunscreen
Sun protection is still recommended
🕶️
Sunglasses
Useful for sunny periods
Traveling to United States in December?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31