S
M
T
W
T
F
S
30
67°
57°
31
70°
57°
1
74°
58°
2
72°
57°
3
75°
53°
4
70°
49°
5
70°
49°
6
64°
46°
7
66°
55°
8
70°
56°
9
73°
57°
10
75°
53°
11
72°
52°
12
66°
55°
13
69°
49°
14
69°
51°
15
64°
53°
16
67°
52°
17
69°
49°
18
71°
50°
19
67°
50°
20
69°
45°
21
65°
42°
22
61°
50°
23
62°
54°
24
70°
52°
25
70°
50°
26
66°
54°
27
67°
50°
28
71°
46°
29
66°
49°
30
63°
50°
1
69°
43°
2
69°
40°
3
57°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Ignace
St. Ignace's September 2026 forecast shows daily high temperatures ranging from 57° to 75°, with overnight lows between 39° and 58°. The average high for September is 68° with an average low of 51°. 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 St. Ignace. See also: October | November | December.
