Weather in St. Louis in September
St. Louis, United States averages a high of 26.6°C (79.9°F) and low of 16.7°C (62.1°F) in September, with 7 rain days and 10.1 hours of daily sunshine. Travel score: 88.9/100 (Excellent). The best time to visit St. Louis is September.
High
27°C80°F
Low
17°C62°F
🌧️
7
rain days
☀️
10.1
hrs/day sunshine
💧
67%
humidity
89— Excellent
September in St. Louis is warm and mostly dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in St. Louis?
How much does it rain in St. Louis in September?
St. Louis receives an average of 89.9mm of rainfall across 7 rainy days in September. The annual total is 1091.3mm.
What should I pack for St. Louis in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 27°C
🧴
Sunscreen SPF 30+
10 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to United States in September?
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