S
M
T
W
T
F
S
28
89°
66°
29
89°
72°
30
91°
75°
1
94°
74°
2
95°
75°
3
91°
73°
4
90°
72°
5
88°
69°
6
85°
70°
7
88°
70°
8
87°
67°
9
86°
68°
10
87°
69°
11
87°
68°
12
88°
68°
13
87°
67°
14
86°
65°
15
81°
62°
16
82°
62°
17
81°
61°
18
82°
63°
19
82°
69°
20
84°
68°
21
89°
69°
22
88°
68°
23
88°
69°
24
89°
69°
25
88°
68°
26
89°
69°
27
89°
70°
28
90°
70°
29
91°
68°
30
89°
69°
31
89°
68°
1
86°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Illiopolis
Illiopolis's July 2026 forecast shows daily high temperatures ranging from 81° to 95°, with overnight lows between 61° and 75°. The average high for July is 87° with an average low of 68°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Illiopolis. See also: August | September | October.
