S
M
T
W
T
F
S
30
72°
48°
31
71°
62°
1
74°
62°
2
69°
60°
3
67°
58°
4
59°
53°
5
56°
52°
6
56°
51°
7
58°
52°
8
56°
46°
9
59°
50°
10
66°
56°
11
64°
55°
12
59°
52°
13
61°
54°
14
60°
51°
15
56°
48°
16
55°
50°
17
57°
49°
18
56°
49°
19
55°
48°
20
54°
46°
21
57°
50°
22
51°
46°
23
50°
45°
24
51°
46°
25
50°
45°
26
50°
45°
27
49°
44°
28
49°
44°
29
50°
43°
30
49°
44°
1
48°
44°
2
48°
43°
3
49°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Unalaska
Unalaska's September 2026 forecast shows daily high temperatures ranging from 48° to 66°, with overnight lows between 43° and 56°. The average high for September is 54° with an average low of 48°. 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 Unalaska. See also: October | November | December.
