S
M
T
W
T
F
S
26
97°
74°
27
97°
78°
28
91°
75°
29
87°
68°
30
89°
65°
31
79°
69°
1
76°
69°
2
82°
67°
3
88°
63°
4
89°
64°
5
88°
66°
6
76°
67°
7
91°
68°
8
89°
68°
9
92°
71°
10
92°
74°
11
96°
77°
12
93°
74°
13
95°
74°
14
93°
79°
15
93°
76°
16
93°
73°
17
83°
68°
18
87°
64°
19
81°
71°
20
86°
68°
21
89°
64°
22
86°
67°
23
83°
60°
24
84°
56°
25
88°
64°
26
N/A
27
86°
63°
28
86°
61°
29
89°
63°
30
95°
70°
31
95°
72°
1
95°
73°
2
95°
72°
3
93°
71°
4
93°
71°
5
94°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Granite City
Granite City's August 2026 forecast shows daily high temperatures ranging from 86° to 95°, with overnight lows between 61° and 73°. The average high for August is 92° with an average low of 69°. 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 Granite City. See also: September | October | November.
