S
M
T
W
T
F
S
30
81°
53°
31
86°
49°
1
82°
53°
2
87°
54°
3
87°
52°
4
86°
48°
5
83°
47°
6
80°
48°
7
80°
51°
8
83°
48°
9
81°
50°
10
78°
46°
11
78°
44°
12
76°
47°
13
78°
50°
14
80°
42°
15
77°
41°
16
74°
42°
17
74°
42°
18
75°
39°
19
74°
38°
20
71°
39°
21
73°
39°
22
73°
41°
23
78°
46°
24
78°
46°
25
80°
48°
26
80°
46°
27
75°
44°
28
79°
35°
29
70°
36°
30
69°
47°
1
70°
43°
2
74°
46°
3
77°
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 69° to 87°, with overnight lows between 35° and 54°. The average high for September is 78° with an average low of 45°. 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.
