Weather in Casper in September
Casper, United States averages a high of 23.7°C (74.7°F) and low of 9.7°C (49.5°F) in September, with 5 rain days and 11.1 hours of daily sunshine. Travel score: 87/100 (Excellent). The best time to visit Casper is August.
High
24°C75°F
Low
10°C49°F
🌧️
5
rain days
☀️
11.1
hrs/day sunshine
💧
45%
humidity
87— Excellent
September in Casper is warm and mostly dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Casper?
How much does it rain in Casper in September?
Casper receives an average of 26.6mm of rainfall across 5 rainy days in September. The annual total is 373.7mm.
What should I pack for Casper 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 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