Weather in Boise in September
Boise, United States averages a high of 26.5°C (79.7°F) and low of 12.7°C (54.9°F) in September, with 2 rain days and 11.4 hours of daily sunshine. Travel score: 95.9/100 (Excellent). The best time to visit Boise is August.
High
27°C80°F
Low
13°C55°F
🌧️
2
rain days
☀️
11.4
hrs/day sunshine
💧
39%
humidity
96— Excellent
September in Boise is warm and dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Boise?
How much does it rain in Boise in September?
Boise receives an average of 11.2mm of rainfall across 2 rainy days in September. The annual total is 320.6mm.
What should I pack for Boise in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 27°C
🧴
Sunscreen SPF 30+
11 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Recommended
🧥
Evening jacket or cardigan
Temperature drops 14°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