S
M
T
W
T
F
S
30
60°
49°
31
76°
45°
1
84°
41°
2
75°
47°
3
65°
46°
4
63°
48°
5
72°
48°
6
69°
51°
7
54°
51°
8
58°
46°
9
72°
45°
10
73°
43°
11
66°
49°
12
68°
51°
13
59°
41°
14
54°
42°
15
59°
48°
16
70°
42°
17
72°
38°
18
74°
41°
19
75°
45°
20
73°
41°
21
75°
39°
22
74°
38°
23
74°
39°
24
78°
42°
25
71°
48°
26
61°
36°
27
57°
35°
28
61°
39°
29
64°
39°
30
63°
38°
1
61°
37°
2
59°
36°
3
61°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Kalispell
Kalispell's September 2026 forecast shows daily high temperatures ranging from 57° to 78°, with overnight lows between 35° and 48°. The average high for September is 65° with an average low of 39°. 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 Kalispell. See also: October | November | December.
