S
M
T
W
T
F
S
30
90°
66°
31
88°
64°
1
84°
63°
2
88°
63°
3
88°
70°
4
91°
68°
5
84°
68°
6
72°
64°
7
79°
64°
8
81°
66°
9
81°
57°
10
80°
59°
11
80°
55°
12
73°
53°
13
62°
55°
14
75°
51°
15
66°
52°
16
66°
53°
17
69°
54°
18
68°
55°
19
71°
53°
20
68°
51°
21
68°
55°
22
67°
54°
23
71°
49°
24
74°
56°
25
76°
57°
26
75°
56°
27
75°
56°
28
72°
55°
29
70°
54°
30
72°
52°
1
64°
52°
2
71°
51°
3
69°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Spirit Lake
Spirit Lake's September 2026 forecast shows daily high temperatures ranging from 62° to 80°, with overnight lows between 49° and 59°. The average high for September is 71° 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 Spirit Lake. See also: October | November | December.
