S
M
T
W
T
F
S
30
71°
55°
31
75°
55°
1
76°
54°
2
75°
53°
3
67°
51°
4
65°
43°
5
66°
42°
6
65°
41°
7
66°
49°
8
68°
53°
9
70°
52°
10
75°
47°
11
75°
41°
12
64°
42°
13
62°
41°
14
65°
52°
15
71°
51°
16
72°
51°
17
72°
50°
18
71°
51°
19
72°
48°
20
72°
40°
21
69°
38°
22
58°
37°
23
59°
36°
24
59°
42°
25
66°
46°
26
67°
40°
27
65°
36°
28
57°
35°
29
58°
36°
30
59°
41°
1
61°
37°
2
61°
42°
3
62°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Windsor
Windsor's September 2026 forecast shows daily high temperatures ranging from 57° to 76°, with overnight lows between 35° and 55°. The average high for September is 67° with an average low of 45°. 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 Windsor. See also: October | November | December.
