S
M
T
W
T
F
S
30
72°
51°
31
78°
59°
1
77°
60°
2
75°
57°
3
71°
53°
4
70°
50°
5
70°
49°
6
71°
49°
7
73°
57°
8
74°
50°
9
68°
48°
10
68°
47°
11
69°
44°
12
66°
47°
13
66°
48°
14
65°
47°
15
66°
46°
16
67°
45°
17
66°
46°
18
67°
45°
19
65°
45°
20
64°
43°
21
63°
43°
22
65°
44°
23
68°
48°
24
71°
43°
25
72°
49°
26
73°
50°
27
64°
47°
28
65°
43°
29
65°
41°
30
66°
40°
1
62°
48°
2
70°
49°
3
69°
39°
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 62° to 78°, with overnight lows between 39° and 60°. The average high for September is 69° 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.
