S
M
T
W
T
F
S
30
79°
54°
31
75°
52°
1
73°
48°
2
69°
48°
3
64°
58°
4
77°
61°
5
69°
53°
6
66°
51°
7
77°
45°
8
74°
46°
9
64°
42°
10
80°
60°
11
71°
51°
12
69°
44°
13
64°
56°
14
69°
53°
15
69°
43°
16
66°
47°
17
69°
53°
18
74°
53°
19
64°
44°
20
59°
41°
21
68°
48°
22
65°
44°
23
64°
40°
24
71°
42°
25
70°
53°
26
63°
55°
27
64°
53°
28
58°
55°
29
64°
54°
30
69°
53°
1
72°
55°
2
71°
53°
3
70°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Winter Harbor
Winter Harbor's September 2026 forecast shows daily high temperatures ranging from 58° to 72°, with overnight lows between 42° and 55°. The average high for September is 67° 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 Winter Harbor. See also: October | November | December.
