S
M
T
W
T
F
S
26
87°
71°
27
80°
65°
28
81°
67°
29
84°
69°
30
83°
65°
31
83°
62°
1
81°
63°
2
80°
62°
3
80°
63°
4
81°
62°
5
80°
63°
6
80°
63°
7
81°
64°
8
82°
68°
9
83°
69°
10
86°
67°
11
86°
63°
12
85°
71°
13
88°
63°
14
83°
61°
15
80°
63°
16
80°
63°
17
80°
64°
18
79°
61°
19
80°
60°
20
79°
61°
21
80°
62°
22
78°
60°
23
78°
61°
24
79°
62°
25
79°
67°
26
80°
69°
27
84°
69°
28
86°
67°
29
86°
59°
30
82°
62°
31
79°
61°
1
77°
66°
2
76°
61°
3
78°
57°
4
76°
62°
5
76°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in O'Hare
O'Hare's August 2026 forecast shows daily high temperatures ranging from 76° to 88°, with overnight lows between 57° and 71°. The average high for August is 81° 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 O'Hare. See also: September | October | November.
