S
M
T
W
T
F
S
26
92°
72°
27
86°
70°
28
80°
65°
29
80°
62°
30
87°
63°
31
81°
70°
1
73°
65°
2
78°
65°
3
83°
62°
4
86°
69°
5
82°
70°
6
82°
69°
7
87°
68°
8
84°
70°
9
84°
66°
10
87°
72°
11
81°
69°
12
84°
71°
13
78°
69°
14
80°
70°
15
79°
73°
16
86°
70°
17
80°
67°
18
81°
66°
19
80°
65°
20
78°
62°
21
80°
62°
22
82°
66°
23
77°
61°
24
78°
58°
25
81°
60°
26
84°
70°
27
N/A
28
82°
64°
29
81°
67°
30
88°
72°
31
89°
72°
1
87°
66°
2
86°
66°
3
86°
64°
4
84°
63°
5
80°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Oak Brook
Oak Brook's August 2026 forecast shows daily high temperatures ranging from 80° to 89°, with overnight lows between 63° and 72°. The average high for August is 85° with an average low of 66°. 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 Oak Brook. See also: September | October | November.
