S
M
T
W
T
F
S
30
81°
60°
31
79°
59°
1
76°
63°
2
75°
59°
3
77°
55°
4
76°
60°
5
75°
64°
6
82°
63°
7
84°
64°
8
83°
62°
9
83°
59°
10
75°
61°
11
75°
60°
12
72°
62°
13
82°
58°
14
81°
57°
15
Hist. Avg.
76°
55°
16
Hist. Avg.
75°
55°
17
Hist. Avg.
75°
54°
18
Hist. Avg.
74°
54°
19
Hist. Avg.
74°
53°
20
Hist. Avg.
74°
53°
21
Hist. Avg.
73°
52°
22
Hist. Avg.
73°
52°
23
Hist. Avg.
73°
52°
24
Hist. Avg.
72°
51°
25
Hist. Avg.
72°
51°
26
Hist. Avg.
71°
50°
27
Hist. Avg.
71°
50°
28
Hist. Avg.
70°
49°
29
Hist. Avg.
70°
49°
30
Hist. Avg.
70°
48°
1
Hist. Avg.
69°
48°
2
Hist. Avg.
69°
48°
3
Hist. Avg.
68°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Winnetka
Winnetka's September 2026 forecast shows daily high temperatures ranging from 72° to 84°, with overnight lows between 55° and 64°. The average high for September is 79° with an average low of 60°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Winnetka. See also: October | November | December.
