S
M
T
W
T
F
S
26
86°
68°
27
87°
69°
28
87°
68°
29
88°
69°
30
86°
68°
31
86°
67°
1
81°
65°
2
79°
62°
3
79°
65°
4
80°
67°
5
82°
67°
6
84°
66°
7
86°
67°
8
86°
67°
9
85°
66°
10
85°
66°
11
84°
65°
12
86°
67°
13
85°
67°
14
88°
59°
15
86°
61°
16
82°
63°
17
81°
64°
18
85°
62°
19
86°
58°
20
79°
56°
21
78°
56°
22
78°
57°
23
79°
57°
24
79°
58°
25
80°
61°
26
78°
57°
27
85°
60°
28
85°
57°
29
78°
56°
30
77°
55°
31
76°
55°
1
76°
56°
2
77°
54°
3
76°
54°
4
77°
55°
5
77°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Grant Park
Grant Park's August 2026 forecast shows daily high temperatures ranging from 76° to 88°, with overnight lows between 54° and 69°. The average high for August is 82° with an average low of 62°. 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 Grant Park. See also: September | October | November.
