Weather in Great Falls in September
Great Falls, United States averages a high of 22.1°C (71.8°F) and low of 9.6°C (49.3°F) in September, with 6 rain days and 10.5 hours of daily sunshine. Travel score: 85.8/100 (Excellent). The best time to visit Great Falls is August.
High
22°C72°F
Low
10°C49°F
🌧️
6
rain days
☀️
10.5
hrs/day sunshine
💧
51%
humidity
86— Excellent
September in Great Falls is warm and mostly dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Great Falls?
How much does it rain in Great Falls in September?
Great Falls receives an average of 36.3mm of rainfall across 6 rainy days in September. The annual total is 396.9mm.
What should I pack for Great Falls in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 22°C
🧴
Sunscreen SPF 30+
11 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Evening jacket or cardigan
Temperature drops 13°C from day to night
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