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7 Days
14 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Rapid City, SD
Content continues below
September
Average Temperature
High
24°
Feels 24
Low
11°
Feels 9
Average Precipitation
12 Days
Rain amount
42.6mm
Snow amount
0.4cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
23°
14
25°
15
20°
16
27°
17
24°
18
25°
19
22°
20
24°
21
24°
22
26°
23
27°
24
27°
25
26°
26
25°
27
25°
28
29
30
Forecast
Sunday, September 13, 2026
Day
23°
Feels 23
Wind
27 km/h SE
Gust
41 km/h
Humidity
44%
P.O.P
30%
Night
17°
Feels 16
Wind
27 km/h SE
Gust
41 km/h
Humidity
94%
P.O.P
40%
Rain
~1 mm
Historical Averages
Sep 13
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.