Typical Weather in Rapid City, SD in September
74° F Avg High
51° F Avg Low
4 Rainy Days
☀️ Temperature Summary
September is a popular time of year to visit, with an inviting climate characterized by warm temperatures. September is one of the warmer months of the year for Rapid City, with highs averaging around 74°F. You can expect overnight lows near 51°F most days. Temperatures will usually fall as the month goes on, with daily high temperatures ranging between 79°F and 66°F.
The warm, dry temperatures in September make Rapid City a great destination to relax and soak up the sun.
High Temps Throughout the Year
🎒 What to Pack
Pick up a few of these items to keep your trip fun and comfortable.
☔ Rain Summary
In September you can expect close to a 12% chance of rain for any given day. It rains less than usual in September, with total rainfall for the month typically near 1 inches.
Rainfall Throughout the Year
Planning a trip to Rapid City? Try our free trip weather planner