S
M
T
W
T
F
S
30
79°
57°
31
84°
61°
1
84°
61°
2
82°
60°
3
84°
53°
4
77°
51°
5
76°
53°
6
80°
59°
7
83°
59°
8
82°
58°
9
76°
57°
10
78°
58°
11
81°
59°
12
82°
58°
13
81°
58°
14
82°
57°
15
81°
57°
16
80°
56°
17
80°
52°
18
78°
48°
19
72°
46°
20
72°
46°
21
70°
45°
22
71°
48°
23
71°
47°
24
75°
46°
25
71°
53°
26
76°
54°
27
74°
52°
28
75°
52°
29
76°
51°
30
76°
50°
1
72°
49°
2
73°
52°
3
68°
46°
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 68° to 84°, with overnight lows between 45° and 61°. The average high for September is 77° 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.
