S
M
T
W
T
F
S
30
79°
66°
31
82°
65°
1
81°
64°
2
75°
61°
3
74°
64°
4
74°
64°
5
79°
63°
6
81°
64°
7
81°
64°
8
82°
65°
9
81°
63°
10
77°
62°
11
79°
63°
12
81°
62°
13
79°
63°
14
74°
51°
15
69°
53°
16
70°
56°
17
73°
57°
18
68°
51°
19
69°
52°
20
72°
55°
21
74°
58°
22
75°
56°
23
76°
49°
24
68°
50°
25
70°
53°
26
73°
57°
27
72°
53°
28
74°
46°
29
65°
45°
30
64°
48°
1
63°
54°
2
70°
54°
3
71°
53°
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 45° and 66°. The average high for September is 74° with an average low of 57°. 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.
