S
M
T
W
T
F
S
30
82°
59°
31
77°
55°
1
75°
55°
2
74°
54°
3
74°
54°
4
75°
55°
5
76°
61°
6
75°
62°
7
79°
61°
8
81°
59°
9
81°
59°
10
76°
60°
11
81°
60°
12
82°
59°
13
80°
60°
14
78°
58°
15
81°
48°
16
74°
48°
17
71°
47°
18
71°
49°
19
72°
51°
20
71°
55°
21
76°
55°
22
70°
54°
23
76°
56°
24
77°
54°
25
75°
55°
26
77°
55°
27
77°
49°
28
76°
43°
29
74°
43°
30
65°
48°
1
64°
44°
2
66°
49°
3
64°
48°
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 64° to 82°, with overnight lows between 43° and 62°. The average high for September is 75° 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.
