S
M
T
W
T
F
S
30
75°
60°
31
73°
58°
1
70°
54°
2
76°
62°
3
80°
56°
4
78°
54°
5
74°
49°
6
74°
54°
7
76°
57°
8
78°
48°
9
76°
46°
10
66°
45°
11
65°
46°
12
65°
47°
13
67°
46°
14
66°
43°
15
63°
42°
16
62°
43°
17
63°
43°
18
63°
44°
19
64°
43°
20
63°
43°
21
65°
49°
22
70°
51°
23
70°
42°
24
69°
52°
25
67°
46°
26
69°
39°
27
60°
48°
28
62°
47°
29
60°
44°
30
59°
46°
1
61°
39°
2
57°
45°
3
58°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ottertail
Ottertail's September 2026 forecast shows daily high temperatures ranging from 57° to 80°, with overnight lows between 39° and 62°. The average high for September is 68° 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 Ottertail. See also: October | November | December.
