S
M
T
W
T
F
S
26
82°
56°
27
79°
54°
28
79°
53°
29
78°
54°
30
78°
54°
31
80°
62°
1
89°
55°
2
88°
56°
3
82°
54°
4
80°
57°
5
84°
61°
6
89°
62°
7
89°
58°
8
87°
56°
9
88°
51°
10
78°
54°
11
79°
53°
12
79°
57°
13
83°
59°
14
87°
60°
15
78°
54°
16
79°
58°
17
Hist. Avg.
87°
60°
18
Hist. Avg.
87°
60°
19
Hist. Avg.
87°
60°
20
Hist. Avg.
86°
60°
21
Hist. Avg.
86°
60°
22
Hist. Avg.
86°
59°
23
Hist. Avg.
86°
59°
24
Hist. Avg.
86°
59°
25
Hist. Avg.
85°
58°
26
Hist. Avg.
85°
58°
27
Hist. Avg.
85°
58°
28
Hist. Avg.
84°
57°
29
Hist. Avg.
84°
57°
30
Hist. Avg.
84°
57°
31
Hist. Avg.
83°
56°
1
Hist. Avg.
83°
56°
2
Hist. Avg.
83°
56°
3
Hist. Avg.
82°
55°
4
Hist. Avg.
82°
55°
5
Hist. Avg.
81°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Spearfish
Spearfish's August 2026 forecast shows daily high temperatures ranging from 78° to 89°, with overnight lows between 51° and 62°. The average high for August is 83° with an average low of 56°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Spearfish. See also: September | October | November.
