S
M
T
W
T
F
S
30
79°
58°
31
77°
67°
1
78°
66°
2
75°
65°
3
84°
70°
4
83°
67°
5
79°
62°
6
72°
57°
7
79°
53°
8
79°
59°
9
79°
60°
10
86°
70°
11
77°
59°
12
N/A
13
79°
67°
14
78°
52°
15
71°
56°
16
76°
64°
17
80°
64°
18
77°
62°
19
75°
58°
20
72°
56°
21
71°
55°
22
71°
55°
23
70°
57°
24
71°
54°
25
71°
54°
26
66°
51°
27
67°
58°
28
74°
57°
29
74°
55°
30
67°
52°
1
66°
52°
2
68°
55°
3
72°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Middle Island
Middle Island's September 2026 forecast shows daily high temperatures ranging from 66° to 80°, with overnight lows between 51° and 67°. The average high for September is 72° 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 Middle Island. See also: October | November | December.
