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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 Regional Airport, SD
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September
Average Temperature
High
24°
Feels 24
Low
10°
Feels 8
Average Precipitation
9 Days
Rain amount
36mm
Snow amount
0.4cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
4
5
33°
6
33°
7
33°
8
29°
9
27°
10
30°
11
32°
12
29°
13
26°
14
25°
15
26°
16
26°
17
25°
18
24°
19
24°
20
21
22
23
24
25
26
27
28
29
30
Forecast
Saturday, September 5, 2026
Day
33°
Feels 33
Wind
14 km/h N
Gust
21 km/h
Humidity
26%
P.O.P
40%
Rain
~1 mm
Night
18°
Feels 18
Wind
23 km/h S
Gust
35 km/h
Humidity
77%
P.O.P
20%
Historical Averages
Sep 5
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.