S
M
T
W
T
F
S
26
85°
73°
27
86°
71°
28
85°
65°
29
80°
66°
30
83°
66°
31
82°
71°
1
81°
72°
2
85°
71°
3
85°
66°
4
83°
62°
5
78°
64°
6
77°
65°
7
75°
69°
8
83°
72°
9
84°
71°
10
84°
72°
11
83°
72°
12
84°
70°
13
85°
71°
14
84°
70°
15
83°
69°
16
84°
69°
17
82°
68°
18
84°
70°
19
80°
71°
20
81°
68°
21
83°
63°
22
Hist. Avg.
82°
66°
23
Hist. Avg.
82°
66°
24
Hist. Avg.
82°
66°
25
Hist. Avg.
82°
65°
26
Hist. Avg.
82°
65°
27
Hist. Avg.
81°
65°
28
Hist. Avg.
81°
65°
29
Hist. Avg.
81°
64°
30
Hist. Avg.
81°
64°
31
Hist. Avg.
81°
64°
1
Hist. Avg.
80°
64°
2
Hist. Avg.
80°
64°
3
Hist. Avg.
80°
63°
4
Hist. Avg.
80°
63°
5
Hist. Avg.
80°
63°
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 75° to 86°, with overnight lows between 62° and 73°. The average high for August is 83° 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.
