Weather in Simi Valley in September
Simi Valley, United States averages a high of 29.9°C (85.8°F) and low of 17.9°C (64.2°F) in September, with 1 rain days and 11.7 hours of daily sunshine. Travel score: 99/100 (Excellent). The best time to visit Simi Valley is August.
High
30°C86°F
Low
18°C64°F
🌧️
1
rain days
☀️
11.7
hrs/day sunshine
💧
59%
humidity
99— Excellent
September in Simi Valley is hot and dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Simi Valley?
How much does it rain in Simi Valley in September?
Simi Valley receives an average of 5.9mm of rainfall across 1 rainy days in September. The annual total is 375.5mm.
What should I pack for Simi Valley in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 30°C
🧴
Sunscreen SPF 30+
12 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
🎉Visiting United States in September?
Don't miss any public holidays — check before you book!
Compare Simi Valley
Popular comparisons:
How can I plan my trip to Simi Valley?
What other cities are near Simi Valley?
What are other popular cities in United States?
What is the weather like in other months in Simi Valley?
Data based on 1994–2024 averages · Last updated: 2024-12-31