S
M
T
W
T
F
S
26
76°
61°
27
74°
61°
28
75°
62°
29
77°
67°
30
79°
68°
31
79°
66°
1
77°
65°
2
79°
66°
3
83°
59°
4
76°
60°
5
75°
62°
6
76°
61°
7
80°
65°
8
75°
67°
9
82°
66°
10
76°
66°
11
75°
62°
12
Hist. Avg.
79°
64°
13
Hist. Avg.
79°
64°
14
Hist. Avg.
79°
64°
15
Hist. Avg.
79°
64°
16
Hist. Avg.
79°
64°
17
Hist. Avg.
79°
64°
18
Hist. Avg.
78°
64°
19
Hist. Avg.
78°
64°
20
Hist. Avg.
78°
64°
21
Hist. Avg.
78°
64°
22
Hist. Avg.
78°
63°
23
Hist. Avg.
78°
63°
24
Hist. Avg.
78°
63°
25
Hist. Avg.
78°
63°
26
Hist. Avg.
77°
63°
27
Hist. Avg.
77°
62°
28
Hist. Avg.
77°
62°
29
Hist. Avg.
77°
62°
30
Hist. Avg.
77°
62°
31
Hist. Avg.
76°
61°
1
Hist. Avg.
76°
61°
2
Hist. Avg.
76°
61°
3
Hist. Avg.
76°
61°
4
Hist. Avg.
76°
60°
5
Hist. Avg.
75°
60°
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 83°, with overnight lows between 59° and 68°. The average high for August is 77° with an average low of 64°. 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.
