S
M
T
W
T
F
S
26
89°
69°
27
89°
70°
28
90°
70°
29
91°
68°
30
89°
69°
31
89°
68°
1
86°
66°
2
82°
62°
3
82°
66°
4
81°
67°
5
82°
67°
6
84°
66°
7
86°
67°
8
86°
67°
9
85°
68°
10
87°
67°
11
85°
67°
12
87°
66°
13
87°
66°
14
91°
66°
15
90°
64°
16
87°
66°
17
86°
64°
18
84°
65°
19
87°
58°
20
81°
57°
21
79°
56°
22
79°
57°
23
80°
57°
24
81°
58°
25
81°
61°
26
80°
57°
27
87°
63°
28
87°
63°
29
86°
60°
30
87°
58°
31
79°
57°
1
78°
59°
2
79°
55°
3
77°
55°
4
78°
60°
5
78°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Illiopolis
Illiopolis's August 2026 forecast shows daily high temperatures ranging from 77° to 91°, with overnight lows between 55° and 70°. The average high for August is 84° with an average low of 63°. 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 Illiopolis. See also: September | October | November.
