Weather in Rapid City in August
Rapid City, United States averages a high of 28.5°C (83.3°F) and low of 16.4°C (61.5°F) in August, with 9 rain days and 12.6 hours of daily sunshine. Travel score: 88.1/100 (Excellent). The best time to visit Rapid City is August.
High
29°C83°F
Low
16°C62°F
🌧️
9
rain days
☀️
12.6
hrs/day sunshine
💧
54%
humidity
88— Excellent
August in Rapid City is hot and occasionally wet — ideal for sightseeing and outdoor activities.
What are the average temperatures in Rapid City?
How much does it rain in Rapid City in August?
Rapid City receives an average of 53.1mm of rainfall across 9 rainy days in August. The annual total is 557.4mm.
What should I pack for Rapid City in August?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 29°C
🧴
Sunscreen SPF 30+
13 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to United States in August?
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