S
M
T
W
T
F
S
26
77°
66°
27
78°
64°
28
84°
67°
29
83°
65°
30
78°
66°
31
79°
67°
1
81°
67°
2
80°
66°
3
84°
67°
4
84°
67°
5
83°
65°
6
83°
64°
7
84°
67°
8
83°
67°
9
84°
68°
10
85°
67°
11
84°
66°
12
83°
66°
13
83°
65°
14
81°
63°
15
77°
60°
16
77°
60°
17
78°
65°
18
77°
65°
19
78°
64°
20
80°
63°
21
78°
65°
22
78°
64°
23
80°
65°
24
85°
64°
25
82°
64°
26
81°
62°
27
79°
63°
28
82°
64°
29
81°
63°
30
78°
64°
31
78°
63°
1
77°
64°
2
77°
63°
3
79°
64°
4
82°
63°
5
76°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Grundy
Grundy's August 2026 forecast shows daily high temperatures ranging from 76° to 85°, with overnight lows between 56° and 68°. The average high for August is 81° 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 Grundy. See also: September | October | November.
