S
M
T
W
T
F
S
26
87°
68°
27
88°
70°
28
80°
62°
29
79°
59°
30
83°
57°
31
79°
63°
1
70°
65°
2
78°
64°
3
82°
60°
4
84°
59°
5
85°
65°
6
80°
68°
7
85°
67°
8
84°
65°
9
87°
67°
10
89°
74°
11
83°
67°
12
82°
68°
13
80°
69°
14
79°
70°
15
81°
71°
16
86°
72°
17
79°
63°
18
79°
62°
19
82°
65°
20
80°
61°
21
80°
56°
22
81°
61°
23
79°
51°
24
77°
52°
25
78°
59°
26
83°
60°
27
80°
58°
28
79°
58°
29
78°
61°
30
80°
60°
31
78°
56°
1
79°
56°
2
80°
58°
3
79°
59°
4
78°
57°
5
80°
57°
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 77° to 83°, with overnight lows between 51° and 61°. The average high for August is 79° with an average low of 57°. 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.
