Weather in Idaho Falls in September
Idaho Falls, United States averages a high of 24°C (75.2°F) and low of 9.4°C (48.9°F) in September, with 4 rain days and 11.3 hours of daily sunshine. Travel score: 90/100 (Excellent). The best time to visit Idaho Falls is July.
High
24°C75°F
Low
9°C49°F
🌧️
4
rain days
☀️
11.3
hrs/day sunshine
💧
40%
humidity
90— Excellent
September in Idaho Falls is warm and mostly dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Idaho Falls?
How much does it rain in Idaho Falls in September?
Idaho Falls receives an average of 24.1mm of rainfall across 4 rainy days in September. The annual total is 354.2mm.
What should I pack for Idaho Falls in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 24°C
🧴
Sunscreen SPF 30+
11 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Evening jacket or cardigan
Temperature drops 15°C from day to night
🎉Visiting United States in September?
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Data based on 1994–2024 averages · Last updated: 2024-12-31