S
M
T
W
T
F
S
26
91°
71°
27
88°
68°
28
79°
68°
29
80°
64°
30
N/A
31
81°
68°
1
72°
67°
2
74°
66°
3
75°
68°
4
79°
70°
5
81°
67°
6
79°
70°
7
81°
71°
8
82°
72°
9
83°
69°
10
83°
71°
11
82°
71°
12
83°
72°
13
81°
68°
14
77°
65°
15
75°
64°
16
76°
71°
17
83°
71°
18
77°
70°
19
76°
67°
20
78°
67°
21
80°
64°
22
74°
64°
23
74°
65°
24
75°
64°
25
74°
63°
26
74°
62°
27
75°
65°
28
79°
67°
29
82°
70°
30
81°
70°
31
74°
71°
1
81°
70°
2
77°
65°
3
73°
62°
4
76°
67°
5
80°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Chicago
Chicago's August 2026 forecast shows daily high temperatures ranging from 72° to 83°, with overnight lows between 62° and 72°. The average high for August is 78° 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 August weather will actually feel in Chicago. See also: September | October | November.
