S
M
T
W
T
F
S
30
72°
60°
31
84°
64°
1
87°
53°
2
87°
57°
3
85°
55°
4
76°
66°
5
85°
60°
6
88°
56°
7
85°
56°
8
75°
64°
9
82°
53°
10
78°
48°
11
86°
47°
12
75°
53°
13
68°
37°
14
69°
33°
15
72°
45°
16
74°
38°
17
72°
48°
18
64°
47°
19
64°
54°
20
63°
47°
21
65°
45°
22
70°
34°
23
73°
35°
24
N/A
25
78°
43°
26
77°
41°
27
70°
39°
28
80°
47°
29
77°
48°
30
78°
59°
1
67°
42°
2
63°
33°
3
62°
32°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Ontonagon
Ontonagon's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Ontonagon. See also: October | November | December.
