S
M
T
W
T
F
S
30
77°
54°
31
72°
50°
1
70°
51°
2
70°
50°
3
71°
49°
4
71°
54°
5
74°
58°
6
77°
58°
7
76°
57°
8
76°
54°
9
75°
56°
10
76°
57°
11
79°
56°
12
76°
57°
13
77°
58°
14
75°
49°
15
78°
44°
16
66°
43°
17
66°
43°
18
67°
47°
19
66°
47°
20
66°
53°
21
71°
52°
22
66°
50°
23
73°
54°
24
74°
53°
25
74°
53°
26
75°
52°
27
75°
45°
28
73°
40°
29
70°
40°
30
61°
44°
1
60°
40°
2
62°
46°
3
61°
42°
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 79°, with overnight lows between 40° and 58°. The average high for September is 71° with an average low of 50°. 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.
