S
M
T
W
T
F
S
30
72°
65°
31
76°
56°
1
79°
64°
2
83°
62°
3
79°
60°
4
76°
55°
5
74°
55°
6
71°
48°
7
76°
47°
8
75°
55°
9
73°
61°
10
74°
53°
11
68°
44°
12
80°
42°
13
78°
63°
14
66°
46°
15
69°
44°
16
74°
57°
17
75°
57°
18
69°
44°
19
64°
46°
20
65°
43°
21
61°
44°
22
64°
42°
23
66°
52°
24
67°
51°
25
68°
49°
26
68°
48°
27
69°
51°
28
69°
52°
29
68°
53°
30
67°
44°
1
67°
51°
2
63°
44°
3
61°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Thousand Islands Bridge
Thousand Islands Bridge's September 2026 forecast shows daily high temperatures ranging from 61° to 75°, with overnight lows between 42° and 57°. The average high for September is 67° 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 Thousand Islands Bridge. See also: October | November | December.
