S
M
T
W
T
F
S
30
77°
55°
31
80°
54°
1
82°
59°
2
81°
61°
3
83°
61°
4
80°
52°
5
81°
59°
6
81°
59°
7
80°
60°
8
82°
60°
9
83°
59°
10
84°
59°
11
84°
58°
12
83°
59°
13
81°
59°
14
80°
58°
15
79°
58°
16
77°
57°
17
76°
56°
18
77°
52°
19
74°
47°
20
71°
48°
21
71°
51°
22
72°
46°
23
69°
49°
24
69°
54°
25
68°
54°
26
75°
53°
27
69°
55°
28
71°
54°
29
72°
53°
30
70°
43°
1
72°
41°
2
64°
40°
3
63°
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 63° to 84°, with overnight lows between 39° and 61°. The average high for September is 76° with an average low of 54°. 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.
