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7 Days
14 Days
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Monthly
Precipitation
Temperature
Wind
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
24°
14
21°
15
19°
16
25°
17
24°
18
23°
19
20°
20
23°
21
21°
22
25°
23
25°
24
24°
25
23°
26
23°
27
22°
28
29
30
Forecast
Sunday, September 13, 2026
Day
24°
Feels 24
Wind
28 km/h E
Gust
42 km/h
Humidity
41%
P.O.P
20%
Night
16°
Feels 15
Wind
34 km/h SE
Gust
42 km/h
Humidity
83%
P.O.P
40%
Rain
1-3 mm
Historical Averages
Sep 13
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.