S
M
T
W
T
F
S
26
81°
62°
27
84°
64°
28
83°
68°
29
80°
61°
30
83°
55°
31
85°
57°
1
78°
66°
2
81°
67°
3
80°
62°
4
84°
65°
5
84°
67°
6
87°
68°
7
86°
67°
8
87°
68°
9
86°
66°
10
87°
65°
11
85°
65°
12
83°
64°
13
82°
64°
14
84°
64°
15
83°
62°
16
80°
58°
17
88°
66°
18
88°
65°
19
87°
66°
20
88°
65°
21
86°
63°
22
88°
65°
23
89°
66°
24
89°
65°
25
88°
65°
26
87°
64°
27
86°
65°
28
85°
64°
29
84°
64°
30
86°
63°
31
86°
63°
1
87°
62°
2
82°
56°
3
80°
57°
4
81°
56°
5
82°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Grantsville
Grantsville's August 2026 forecast shows daily high temperatures ranging from 80° to 89°, with overnight lows between 56° and 68°. The average high for August is 85° with an average low of 64°. 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 Grantsville. See also: September | October | November.
