S
M
T
W
T
F
S
30
73°
61°
31
73°
59°
1
73°
55°
2
70°
61°
3
79°
66°
4
70°
57°
5
73°
54°
6
79°
57°
7
75°
63°
8
64°
55°
9
66°
54°
10
66°
54°
11
70°
59°
12
73°
54°
13
73°
64°
14
77°
64°
15
73°
59°
16
N/A
17
69°
49°
18
68°
60°
19
70°
56°
20
68°
49°
21
70°
55°
22
73°
53°
23
73°
53°
24
74°
52°
25
71°
52°
26
70°
50°
27
69°
50°
28
70°
52°
29
65°
48°
30
67°
49°
1
66°
48°
2
66°
47°
3
65°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Windsor
Windsor's September 2026 forecast shows daily high temperatures ranging from 65° to 74°, with overnight lows between 42° and 60°. The average high for September is 69° with an average low of 51°. 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.
