S
M
T
W
T
F
S
30
67°
59°
31
69°
59°
1
69°
60°
2
68°
61°
3
74°
60°
4
70°
60°
5
71°
59°
6
70°
60°
7
68°
59°
8
68°
58°
9
71°
59°
10
71°
59°
11
72°
58°
12
73°
59°
13
72°
59°
14
72°
58°
15
71°
58°
16
67°
57°
17
66°
56°
18
66°
57°
19
67°
56°
20
66°
57°
21
68°
52°
22
69°
50°
23
65°
49°
24
64°
50°
25
68°
48°
26
63°
51°
27
63°
53°
28
67°
54°
29
67°
50°
30
66°
44°
1
65°
48°
2
60°
48°
3
63°
47°
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 60° to 74°, with overnight lows between 44° and 61°. The average high for September is 68° 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 Copper Harbor. See also: October | November | December.
