S
M
T
W
T
F
S
30
73°
50°
31
76°
49°
1
76°
49°
2
72°
48°
3
69°
48°
4
68°
43°
5
71°
43°
6
77°
47°
7
78°
47°
8
73°
46°
9
77°
48°
10
76°
46°
11
70°
43°
12
68°
45°
13
65°
38°
14
63°
35°
15
63°
34°
16
66°
36°
17
71°
43°
18
69°
44°
19
62°
41°
20
65°
42°
21
61°
38°
22
63°
34°
23
61°
36°
24
64°
37°
25
68°
40°
26
67°
38°
27
60°
27°
28
58°
26°
29
55°
27°
30
54°
29°
1
55°
33°
2
62°
33°
3
63°
37°
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 54° to 78°, with overnight lows between 26° and 50°. The average high for September is 67° 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.
