S
M
T
W
T
F
S
30
64°
49°
31
68°
52°
1
72°
53°
2
73°
53°
3
72°
52°
4
65°
43°
5
66°
46°
6
65°
45°
7
70°
49°
8
67°
48°
9
65°
44°
10
66°
44°
11
66°
49°
12
64°
53°
13
63°
44°
14
63°
44°
15
64°
45°
16
63°
44°
17
64°
45°
18
67°
45°
19
71°
48°
20
70°
47°
21
66°
45°
22
65°
46°
23
60°
45°
24
62°
44°
25
60°
40°
26
61°
41°
27
60°
43°
28
62°
50°
29
66°
48°
30
58°
43°
1
58°
44°
2
Hist. Avg.
62°
44°
3
Hist. Avg.
62°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Roche Harbor
Roche Harbor's September 2026 forecast shows daily high temperatures ranging from 58° to 73°, with overnight lows between 40° and 53°. The average high for September is 65° with an average low of 46°. 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 Roche Harbor. See also: October | November | December.
