S
M
T
W
T
F
S
26
91°
71°
27
88°
68°
28
79°
68°
29
80°
64°
30
86°
63°
31
82°
71°
1
76°
66°
2
76°
66°
3
82°
63°
4
86°
68°
5
83°
70°
6
80°
69°
7
86°
69°
8
N/A
9
79°
71°
10
82°
70°
11
78°
69°
12
83°
70°
13
78°
69°
14
76°
64°
15
77°
67°
16
76°
65°
17
77°
68°
18
75°
67°
19
79°
68°
20
78°
68°
21
80°
67°
22
84°
73°
23
82°
72°
24
76°
70°
25
78°
71°
26
82°
72°
27
83°
71°
28
82°
70°
29
75°
67°
30
74°
67°
31
74°
66°
1
75°
69°
2
77°
70°
3
75°
70°
4
81°
71°
5
81°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Chicago
Chicago's August 2026 forecast shows daily high temperatures ranging from 74° to 84°, with overnight lows between 64° and 73°. The average high for August is 78° with an average low of 69°. 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.
