S
M
T
W
T
F
S
30
74°
56°
31
77°
55°
1
79°
52°
2
74°
52°
3
70°
51°
4
70°
52°
5
71°
52°
6
73°
60°
7
80°
60°
8
81°
52°
9
76°
52°
10
72°
51°
11
72°
59°
12
75°
51°
13
77°
49°
14
69°
48°
15
70°
53°
16
71°
57°
17
76°
48°
18
71°
47°
19
69°
52°
20
73°
52°
21
69°
56°
22
70°
56°
23
77°
55°
24
77°
55°
25
76°
56°
26
76°
55°
27
77°
54°
28
77°
54°
29
75°
53°
30
76°
54°
1
76°
44°
2
75°
41°
3
65°
42°
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 65° to 81°, with overnight lows between 41° and 60°. The average high for September is 74° with an average low of 52°. 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.
