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14 Days
Weekend
Monthly
Precipitation
Temperature
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Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Spearfish, SD
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September
Average Temperature
High
23°
Feels 23
Low
10°
Feels 9
Average Precipitation
9 Days
Rain amount
37.7mm
Snow amount
0.5cm
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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
14
21°
15
19°
16
26°
17
24°
18
24°
19
23°
20
19°
21
22°
22
25°
23
23°
24
24°
25
23°
26
21°
27
21°
28
21°
29
30
Forecast
Monday, September 14, 2026
Day
21°
Feels 21
Wind
32 km/h NW
Gust
48 km/h
Humidity
30%
P.O.P
20%
Night
7°
Feels 5
Wind
31 km/h NW
Gust
47 km/h
Humidity
76%
P.O.P
10%
Historical Averages
Sep 14
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.