S
M
T
W
T
F
S
30
64°
38°
31
76°
41°
1
82°
49°
2
69°
46°
3
70°
45°
4
70°
46°
5
71°
45°
6
70°
44°
7
70°
44°
8
72°
45°
9
74°
46°
10
75°
47°
11
80°
43°
12
65°
42°
13
66°
40°
14
76°
45°
15
77°
46°
16
77°
44°
17
63°
43°
18
64°
43°
19
70°
44°
20
69°
43°
21
62°
41°
22
65°
39°
23
73°
42°
24
70°
40°
25
60°
38°
26
70°
41°
27
71°
42°
28
69°
42°
29
64°
39°
30
68°
40°
1
69°
41°
2
67°
41°
3
63°
40°
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 60° to 82°, with overnight lows between 38° and 49°. The average high for September is 70° with an average low of 43°. 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.
