S
M
T
W
T
F
S
30
74°
52°
31
78°
54°
1
70°
57°
2
70°
60°
3
79°
61°
4
80°
59°
5
72°
53°
6
71°
49°
7
79°
52°
8
78°
51°
9
74°
67°
10
82°
54°
11
74°
46°
12
76°
53°
13
78°
57°
14
77°
53°
15
72°
52°
16
74°
50°
17
71°
48°
18
71°
49°
19
70°
51°
20
68°
45°
21
65°
50°
22
63°
49°
23
64°
50°
24
68°
48°
25
68°
48°
26
71°
45°
27
63°
42°
28
65°
45°
29
70°
47°
30
71°
48°
1
70°
47°
2
68°
47°
3
66°
46°
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 63° to 82°, with overnight lows between 42° and 67°. 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.
