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
N/A
5
84°
69°
6
77°
68°
7
85°
73°
8
84°
70°
9
84°
74°
10
85°
70°
11
84°
72°
12
77°
71°
13
80°
71°
14
81°
69°
15
79°
68°
16
79°
69°
17
80°
68°
18
85°
72°
19
86°
72°
20
81°
71°
21
83°
72°
22
84°
73°
23
82°
72°
24
82°
72°
25
81°
71°
26
82°
71°
27
80°
68°
28
77°
71°
29
80°
69°
30
81°
70°
31
82°
70°
1
81°
69°
2
78°
70°
3
79°
69°
4
79°
69°
5
81°
68°
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 77° to 86°, with overnight lows between 68° and 74°. The average high for August is 81° with an average low of 70°. 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.
