S
M
T
W
T
F
S
30
73°
53°
31
73°
54°
1
71°
52°
2
69°
49°
3
66°
48°
4
67°
48°
5
68°
47°
6
70°
50°
7
70°
50°
8
71°
52°
9
72°
53°
10
71°
51°
11
69°
50°
12
67°
50°
13
69°
48°
14
64°
45°
15
64°
45°
16
65°
46°
17
65°
45°
18
64°
50°
19
65°
46°
20
63°
44°
21
63°
44°
22
64°
49°
23
65°
49°
24
67°
48°
25
67°
44°
26
64°
45°
27
62°
47°
28
61°
48°
29
62°
47°
30
61°
43°
1
61°
44°
2
60°
42°
3
60°
41°
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 60° to 73°, with overnight lows between 41° and 54°. The average high for September is 66° with an average low of 48°. 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.
