S
M
T
W
T
F
S
30
76°
60°
31
66°
60°
1
78°
65°
2
69°
64°
3
79°
64°
4
75°
62°
5
72°
58°
6
71°
54°
7
73°
51°
8
75°
52°
9
73°
61°
10
78°
61°
11
69°
54°
12
74°
50°
13
79°
63°
14
64°
49°
15
68°
43°
16
72°
56°
17
76°
65°
18
72°
53°
19
65°
46°
20
64°
50°
21
65°
47°
22
61°
44°
23
60°
43°
24
61°
44°
25
64°
46°
26
66°
45°
27
67°
44°
28
67°
46°
29
70°
48°
30
71°
50°
1
66°
49°
2
67°
44°
3
60°
48°
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 71°, with overnight lows between 43° and 50°. The average high for September is 65° with an average low of 46°. 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.
