Simi Valley in December

Average high

17.9°C

Average low

9.8°C

Rainfall

—

— wet days

Comfort score

out of 100

December in Simi Valley averages a daily high of 17.9°C with nights around 9.8°C. Comfortable conditions for being outdoors all day.

Across the year, the best time to visit Simi Valley is October–May.

Based on CHEESEBORO CALIFORNIA, CA US (11.1km), 1995–2024. 30 years of December data.