S
M
T
W
T
F
S
26
87°
68°
27
80°
62°
28
81°
64°
29
83°
66°
30
82°
62°
31
82°
65°
1
82°
61°
2
82°
59°
3
81°
60°
4
79°
58°
5
80°
59°
6
80°
59°
7
81°
60°
8
82°
60°
9
85°
64°
10
80°
64°
11
82°
66°
12
85°
66°
13
85°
67°
14
86°
62°
15
85°
58°
16
83°
60°
17
79°
65°
18
78°
60°
19
79°
57°
20
77°
58°
21
78°
60°
22
81°
61°
23
84°
64°
24
85°
65°
25
84°
57°
26
85°
57°
27
77°
58°
28
78°
57°
29
78°
63°
30
82°
64°
31
84°
64°
1
84°
57°
2
80°
57°
3
83°
62°
4
78°
62°
5
77°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Chicago Heights
Chicago Heights's August 2026 forecast shows daily high temperatures ranging from 77° to 87°, with overnight lows between 57° and 68°. The average high for August is 82° with an average low of 61°. 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 Chicago Heights. See also: September | October | November.
