S
M
T
W
T
F
S
30
72°
48°
31
71°
62°
1
65°
50°
2
58°
49°
3
60°
49°
4
53°
46°
5
54°
50°
6
53°
48°
7
54°
49°
8
53°
45°
9
54°
46°
10
57°
46°
11
50°
41°
12
50°
42°
13
49°
40°
14
46°
39°
15
50°
46°
16
50°
46°
17
51°
43°
18
50°
44°
19
49°
44°
20
49°
43°
21
48°
43°
22
49°
44°
23
49°
41°
24
48°
41°
25
47°
42°
26
48°
41°
27
47°
40°
28
47°
41°
29
48°
43°
30
47°
42°
1
47°
40°
2
46°
40°
3
46°
41°
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 46° to 65°, with overnight lows between 39° and 50°. 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.
