S
M
T
W
T
F
S
30
56°
49°
31
56°
48°
1
55°
47°
2
55°
48°
3
54°
47°
4
55°
47°
5
55°
42°
6
54°
46°
7
52°
47°
8
53°
47°
9
55°
46°
10
55°
46°
11
54°
45°
12
54°
47°
13
53°
46°
14
54°
46°
15
53°
45°
16
53°
46°
17
54°
44°
18
54°
45°
19
52°
45°
20
52°
46°
21
Hist. Avg.
53°
44°
22
Hist. Avg.
53°
43°
23
Hist. Avg.
53°
43°
24
Hist. Avg.
52°
43°
25
Hist. Avg.
52°
43°
26
Hist. Avg.
52°
43°
27
Hist. Avg.
52°
42°
28
Hist. Avg.
51°
42°
29
Hist. Avg.
51°
42°
30
Hist. Avg.
51°
42°
1
Hist. Avg.
51°
42°
2
Hist. Avg.
50°
42°
3
Hist. Avg.
50°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Umnak
Umnak's September 2026 forecast shows daily high temperatures ranging from 52° to 56°, with overnight lows between 42° and 49°. The average high for September is 54° with an average low of 46°. 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.
