S
M
T
W
T
F
S
26
86°
70°
27
87°
71°
28
86°
71°
29
86°
70°
30
87°
72°
31
88°
73°
1
87°
72°
2
90°
73°
3
91°
74°
4
90°
73°
5
91°
74°
6
91°
74°
7
90°
73°
8
89°
73°
9
87°
72°
10
86°
70°
11
86°
69°
12
87°
72°
13
90°
73°
14
91°
73°
15
90°
72°
16
90°
72°
17
91°
73°
18
92°
72°
19
92°
72°
20
90°
70°
21
91°
72°
22
90°
71°
23
90°
72°
24
89°
70°
25
88°
67°
26
87°
69°
27
85°
66°
28
84°
66°
29
84°
67°
30
85°
66°
31
84°
66°
1
84°
67°
2
87°
66°
3
85°
70°
4
88°
69°
5
88°
68°
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 84° to 92°, with overnight lows between 66° and 74°. The average high for August is 88° with an average low of 71°. 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.
