S
M
T
W
T
F
S
30
89°
66°
31
89°
63°
1
90°
62°
2
89°
67°
3
90°
70°
4
94°
69°
5
85°
68°
6
77°
66°
7
81°
66°
8
85°
68°
9
82°
54°
10
82°
48°
11
84°
61°
12
75°
49°
13
68°
44°
14
65°
54°
15
72°
52°
16
74°
48°
17
72°
63°
18
70°
62°
19
64°
59°
20
64°
58°
21
58°
53°
22
60°
52°
23
70°
57°
24
59°
57°
25
65°
58°
26
60°
56°
27
66°
57°
28
71°
58°
29
64°
51°
30
65°
50°
1
67°
49°
2
64°
50°
3
68°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Okoboji
Okoboji's September 2026 forecast shows daily high temperatures ranging from 59° to 71°, with overnight lows between 49° and 58°. The average high for September is 65° with an average low of 54°. 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 Okoboji. See also: October | November | December.
