S
M
T
W
T
F
S
30
65°
49°
31
66°
52°
1
67°
53°
2
70°
53°
3
73°
48°
4
72°
52°
5
71°
46°
6
65°
50°
7
71°
51°
8
65°
46°
9
63°
50°
10
66°
52°
11
62°
46°
12
63°
50°
13
63°
50°
14
61°
47°
15
62°
44°
16
62°
43°
17
62°
49°
18
Hist. Avg.
67°
51°
19
Hist. Avg.
67°
51°
20
Hist. Avg.
67°
51°
21
Hist. Avg.
66°
50°
22
Hist. Avg.
66°
50°
23
Hist. Avg.
66°
50°
24
Hist. Avg.
66°
50°
25
Hist. Avg.
66°
50°
26
Hist. Avg.
65°
50°
27
Hist. Avg.
65°
49°
28
Hist. Avg.
65°
49°
29
Hist. Avg.
64°
49°
30
Hist. Avg.
64°
49°
1
Hist. Avg.
64°
48°
2
Hist. Avg.
64°
48°
3
Hist. Avg.
63°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Copalis Crossing
Copalis Crossing's September 2026 forecast shows daily high temperatures ranging from 61° to 73°, with overnight lows between 43° and 53°. The average high for September is 66° 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 Copalis Crossing. See also: October | November | December.
