Weather in Rapid City in September
Rapid City, United States averages a high of 23.8°C (74.8°F) and low of 11.7°C (53.1°F) in September, with 6 rain days and 10.6 hours of daily sunshine. Travel score: 87.8/100 (Excellent). The best time to visit Rapid City is August.
High
24°C75°F
Low
12°C53°F
🌧️
6
rain days
☀️
10.6
hrs/day sunshine
💧
53%
humidity
88— Excellent
September in Rapid City is warm and mostly dry — ideal for sightseeing and outdoor activities.
What are the average temperatures in Rapid City?
How much does it rain in Rapid City in September?
Rapid City receives an average of 37.1mm of rainfall across 6 rainy days in September. The annual total is 557.4mm.
What should I pack for Rapid City 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 12°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