S
M
T
W
T
F
S
30
65°
53°
31
72°
48°
1
64°
51°
2
67°
52°
3
67°
50°
4
66°
50°
5
68°
50°
6
72°
52°
7
71°
51°
8
70°
53°
9
68°
52°
10
70°
51°
11
68°
50°
12
69°
49°
13
68°
50°
14
69°
51°
15
68°
48°
16
64°
51°
17
63°
52°
18
63°
50°
19
63°
51°
20
64°
52°
21
62°
52°
22
62°
51°
23
61°
48°
24
61°
46°
25
62°
46°
26
62°
50°
27
68°
51°
28
68°
51°
29
67°
50°
30
66°
50°
1
67°
51°
2
67°
51°
3
66°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lopez Island
Lopez Island's September 2026 forecast shows daily high temperatures ranging from 61° to 72°, with overnight lows between 46° and 53°. The average high for September is 66° with an average low of 50°. 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 Lopez Island. See also: October | November | December.
