S
M
T
W
T
F
S
26
86°
67°
27
80°
62°
28
80°
64°
29
83°
66°
30
82°
62°
31
82°
59°
1
80°
60°
2
80°
59°
3
81°
60°
4
79°
59°
5
79°
60°
6
80°
60°
7
80°
61°
8
81°
65°
9
82°
66°
10
85°
64°
11
85°
60°
12
84°
68°
13
87°
60°
14
82°
58°
15
79°
60°
16
80°
60°
17
80°
61°
18
79°
59°
19
78°
58°
20
78°
58°
21
79°
59°
22
77°
58°
23
77°
58°
24
78°
59°
25
78°
65°
26
79°
66°
27
83°
67°
28
86°
64°
29
85°
57°
30
81°
60°
31
79°
59°
1
76°
63°
2
75°
59°
3
77°
55°
4
76°
60°
5
75°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Winnetka
Winnetka's August 2026 forecast shows daily high temperatures ranging from 75° to 87°, 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 Winnetka. See also: September | October | November.
