S
M
T
W
T
F
S
30
82°
67°
31
87°
68°
1
87°
69°
2
88°
71°
3
82°
70°
4
86°
69°
5
80°
63°
6
81°
58°
7
78°
60°
8
81°
70°
9
79°
55°
10
76°
55°
11
80°
61°
12
79°
57°
13
69°
53°
14
70°
52°
15
69°
51°
16
70°
54°
17
72°
54°
18
70°
53°
19
68°
51°
20
71°
49°
21
69°
54°
22
68°
54°
23
70°
53°
24
74°
54°
25
74°
54°
26
73°
53°
27
73°
54°
28
75°
54°
29
74°
53°
30
73°
54°
1
69°
48°
2
63°
43°
3
60°
40°
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 60° to 81°, with overnight lows between 40° and 70°. The average high for September is 72° with an average low of 53°. 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.
