S
M
T
W
T
F
S
30
86°
70°
31
86°
70°
1
89°
68°
2
89°
69°
3
91°
70°
4
89°
70°
5
91°
69°
6
87°
70°
7
82°
68°
8
86°
67°
9
85°
60°
10
83°
59°
11
76°
57°
12
78°
56°
13
77°
57°
14
75°
53°
15
80°
60°
16
79°
59°
17
80°
60°
18
80°
60°
19
79°
58°
20
78°
59°
21
79°
60°
22
80°
60°
23
80°
59°
24
79°
59°
25
79°
58°
26
78°
56°
27
79°
57°
28
78°
56°
29
77°
57°
30
78°
57°
1
77°
56°
2
77°
56°
3
76°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Storm Lake
Storm Lake's September 2026 forecast shows daily high temperatures ranging from 75° to 91°, with overnight lows between 53° and 70°. The average high for September is 81° with an average low of 60°. 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 Storm Lake. See also: October | November | December.
