S
M
T
W
T
F
S
30
72°
60°
31
74°
64°
1
85°
62°
2
71°
60°
3
70°
55°
4
70°
57°
5
70°
54°
6
76°
57°
7
74°
65°
8
71°
62°
9
72°
59°
10
63°
57°
11
79°
58°
12
72°
59°
13
60°
48°
14
64°
46°
15
67°
55°
16
62°
52°
17
65°
55°
18
59°
47°
19
64°
47°
20
60°
45°
21
57°
40°
22
61°
39°
23
63°
46°
24
64°
48°
25
63°
54°
26
68°
54°
27
68°
56°
28
66°
57°
29
68°
55°
30
66°
55°
1
63°
52°
2
60°
51°
3
59°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Copper Harbor
Copper Harbor's September 2026 forecast shows daily high temperatures ranging from 59° to 68°, with overnight lows between 50° and 57°. The average high for September is 65° with an average low of 54°. 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 Copper Harbor. See also: October | November | December.
