S
M
T
W
T
F
S
30
77°
59°
31
85°
51°
1
79°
56°
2
84°
58°
3
85°
56°
4
77°
54°
5
74°
53°
6
80°
56°
7
83°
56°
8
82°
46°
9
82°
45°
10
71°
44°
11
70°
45°
12
69°
50°
13
72°
45°
14
70°
42°
15
69°
43°
16
67°
43°
17
67°
41°
18
66°
41°
19
65°
42°
20
66°
42°
21
68°
45°
22
72°
49°
23
75°
49°
24
69°
48°
25
75°
47°
26
72°
46°
27
67°
41°
28
72°
39°
29
63°
37°
30
61°
47°
1
62°
39°
2
62°
48°
3
71°
35°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in North Spearfish
North Spearfish's September 2026 forecast shows daily high temperatures ranging from 61° to 85°, with overnight lows between 35° and 59°. The average high for September is 72° with an average low of 47°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in North Spearfish. See also: October | November | December.
