Weather · Rapid City, United States
Rapid City Weather in September
Expect mild, some rain in Rapid City through September: highs near 22°C, lows around 13°C, 78mm of rain across the month. It's one of the best months to visit.
Avg high
22°C
72°F
Avg low
13°C
55°F
Rainfall
78mm
#7 wettest of 12
What to pack
Summer clothes by day; a light layer for evenings. Bring a compact umbrella for the odd shower.
Timing a trip around the weather? A Local Friend in Rapid City builds it around the season for you.