S
M
T
W
T
F
S
26
85°
68°
27
79°
62°
28
80°
64°
29
82°
66°
30
81°
62°
31
81°
66°
1
81°
62°
2
81°
59°
3
80°
60°
4
78°
58°
5
79°
59°
6
79°
59°
7
80°
60°
8
80°
60°
9
83°
64°
10
78°
65°
11
81°
66°
12
84°
67°
13
84°
67°
14
83°
62°
15
84°
58°
16
81°
60°
17
77°
64°
18
76°
59°
19
77°
57°
20
75°
57°
21
76°
60°
22
78°
60°
23
82°
63°
24
83°
64°
25
82°
56°
26
82°
56°
27
75°
57°
28
75°
55°
29
76°
62°
30
79°
63°
31
82°
63°
1
81°
55°
2
78°
55°
3
80°
60°
4
75°
60°
5
75°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Oak Brook
Oak Brook's August 2026 forecast shows daily high temperatures ranging from 75° to 85°, with overnight lows between 55° and 68°. The average high for August is 80° with an average low of 61°. 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.
