S
M
T
W
T
F
S
30
68°
54°
31
72°
50°
1
66°
60°
2
64°
58°
3
65°
53°
4
70°
49°
5
71°
52°
6
66°
49°
7
68°
55°
8
71°
48°
9
73°
50°
10
66°
55°
11
65°
54°
12
61°
54°
13
64°
56°
14
67°
54°
15
66°
53°
16
73°
48°
17
76°
49°
18
64°
59°
19
65°
51°
20
63°
53°
21
68°
54°
22
63°
53°
23
64°
48°
24
64°
44°
25
65°
41°
26
64°
45°
27
63°
46°
28
63°
47°
29
64°
47°
30
62°
45°
1
64°
45°
2
63°
44°
3
60°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Copalis Beach
Copalis Beach's September 2026 forecast shows daily high temperatures ranging from 60° to 68°, with overnight lows between 41° and 54°. The average high for September is 64° with an average low of 47°. 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 Copalis Beach. See also: October | November | December.
