S
M
T
W
T
F
S
30
76°
38°
31
88°
39°
1
83°
49°
2
75°
53°
3
63°
42°
4
65°
37°
5
69°
44°
6
65°
46°
7
68°
50°
8
76°
41°
9
84°
44°
10
87°
49°
11
75°
41°
12
70°
50°
13
61°
40°
14
72°
40°
15
75°
44°
16
76°
47°
17
79°
46°
18
77°
48°
19
81°
49°
20
80°
50°
21
75°
48°
22
75°
43°
23
69°
49°
24
77°
49°
25
66°
45°
26
67°
46°
27
66°
40°
28
63°
37°
29
65°
41°
30
64°
38°
1
68°
45°
2
70°
44°
3
73°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Island City
Island City's September 2026 forecast shows daily high temperatures ranging from 61° to 87°, with overnight lows between 37° and 50°. The average high for September is 73° with an average low of 45°. 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 Island City. See also: October | November | December.
