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°
51°
9
57°
44°
10
65°
50°
11
69°
57°
12
65°
52°
13
65°
60°
14
66°
52°
15
55°
51°
16
59°
50°
17
55°
50°
18
51°
47°
19
50°
45°
20
46°
42°
21
50°
43°
22
52°
42°
23
58°
47°
24
58°
47°
25
57°
48°
26
51°
48°
27
50°
45°
28
50°
45°
29
52°
43°
30
52°
46°
1
51°
43°
2
50°
43°
3
51°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Umnak
Umnak's September 2026 forecast shows daily high temperatures ranging from 50° to 52°, with overnight lows between 43° and 46°. The average high for September is 51° with an average low of 44°. 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 Umnak. See also: October | November | December.
