S
M
T
W
T
F
S
30
75°
68°
31
84°
69°
1
90°
71°
2
95°
70°
3
84°
68°
4
77°
67°
5
79°
62°
6
77°
60°
7
78°
59°
8
81°
57°
9
79°
68°
10
82°
57°
11
75°
55°
12
81°
59°
13
81°
57°
14
69°
53°
15
80°
57°
16
72°
64°
17
71°
63°
18
73°
57°
19
65°
60°
20
64°
58°
21
61°
53°
22
65°
52°
23
66°
55°
24
69°
48°
25
67°
44°
26
70°
49°
27
74°
51°
28
75°
53°
29
76°
48°
30
71°
58°
1
79°
63°
2
69°
49°
3
66°
47°
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 66° to 69°, with overnight lows between 47° and 49°. The average high for September is 68° with an average low of 48°. 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.
