The Weather Network
Weather
Maps
News
Video
|
Welcome
Monthly
⋮
Current
Hourly
7 Days
14 Days
Weekend
Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Rapid City Regional Airport, SD
Content continues below
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
4
34°
5
36°
6
34°
7
34°
8
29°
9
27°
10
30°
11
32°
12
29°
13
26°
14
25°
15
26°
16
26°
17
25°
18
24°
19
20
21
22
23
24
25
26
27
28
29
30
Forecast
Friday, September 4, 2026
Day
34°
Feels 34
Wind
31 km/h SE
Gust
47 km/h
Humidity
25%
P.O.P
10%
Night
18°
Feels 18
Wind
31 km/h SW
Gust
47 km/h
Humidity
57%
P.O.P
0%
Historical Averages
Sep 4
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.
September
Average Temperature
High
24°
Feels 24
Low
10°
Feels 8
Average Precipitation
9 Days
Rain amount
36mm
Snow amount
0.4cm