S
M
T
W
T
F
S
30
80°
50°
31
79°
51°
1
78°
49°
2
69°
47°
3
70°
45°
4
75°
48°
5
79°
48°
6
68°
42°
7
67°
41°
8
69°
44°
9
72°
47°
10
77°
48°
11
77°
47°
12
76°
44°
13
64°
35°
14
74°
43°
15
74°
45°
16
72°
42°
17
73°
43°
18
65°
34°
19
61°
31°
20
63°
36°
21
71°
43°
22
73°
45°
23
74°
43°
24
62°
42°
25
63°
32°
26
60°
29°
27
58°
27°
28
57°
31°
29
57°
29°
30
58°
34°
1
62°
37°
2
67°
34°
3
61°
27°
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 80°, with overnight lows between 27° and 51°. The average high for September is 69° with an average low of 40°. 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.
