Simi Valley in September

Average high

31.8°C

Average low

17.4°C

Rainfall

—

— wet days

Comfort score

out of 100

September in Simi Valley averages a daily high of 31.8°C with nights around 17.4°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. 29 years of September data.