S
M
T
W
T
F
S
30
75°
57°
31
74°
56°
1
73°
55°
2
73°
50°
3
72°
48°
4
74°
49°
5
72°
48°
6
63°
46°
7
63°
50°
8
62°
55°
9
62°
54°
10
63°
50°
11
62°
45°
12
62°
49°
13
61°
52°
14
62°
49°
15
62°
47°
16
61°
46°
17
62°
48°
18
67°
53°
19
70°
48°
20
70°
47°
21
65°
43°
22
60°
43°
23
60°
46°
24
61°
45°
25
59°
43°
26
60°
45°
27
60°
47°
28
61°
46°
29
59°
46°
30
59°
45°
1
60°
49°
2
63°
52°
3
67°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Coupeville
Coupeville's September 2026 forecast shows daily high temperatures ranging from 59° to 75°, with overnight lows between 43° and 57°. The average high for September is 65° with an average low of 49°. 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 Coupeville. See also: October | November | December.
