S
M
T
W
T
F
S
30
81°
56°
31
83°
59°
1
85°
61°
2
84°
64°
3
85°
57°
4
83°
56°
5
79°
60°
6
83°
58°
7
76°
61°
8
83°
63°
9
84°
62°
10
85°
62°
11
84°
61°
12
83°
62°
13
82°
62°
14
82°
54°
15
79°
58°
16
80°
58°
17
79°
57°
18
78°
55°
19
76°
48°
20
71°
51°
21
72°
48°
22
73°
47°
23
69°
49°
24
69°
53°
25
67°
56°
26
74°
57°
27
71°
56°
28
72°
54°
29
68°
51°
30
70°
43°
1
67°
42°
2
63°
41°
3
61°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in French Island
French Island's September 2026 forecast shows daily high temperatures ranging from 61° to 85°, with overnight lows between 41° and 64°. The average high for September is 77° with an average low of 55°. 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 French Island. See also: October | November | December.
