S
M
T
W
T
F
S
30
72°
38°
31
73°
39°
1
77°
43°
2
80°
45°
3
82°
45°
4
82°
43°
5
70°
36°
6
69°
38°
7
71°
41°
8
70°
45°
9
75°
44°
10
73°
37°
11
72°
40°
12
71°
42°
13
71°
40°
14
68°
35°
15
66°
33°
16
64°
31°
17
64°
33°
18
65°
34°
19
66°
38°
20
70°
38°
21
73°
34°
22
64°
32°
23
62°
32°
24
61°
31°
25
60°
32°
26
61°
33°
27
61°
31°
28
60°
32°
29
65°
33°
30
62°
30°
1
57°
33°
2
Hist. Avg.
62°
33°
3
Hist. Avg.
62°
33°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Whitefish
Whitefish's September 2026 forecast shows daily high temperatures ranging from 57° to 82°, with overnight lows between 30° and 45°. The average high for September is 68° with an average low of 37°. 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 Whitefish. See also: October | November | December.
