S
M
T
W
T
F
S
30
79°
56°
31
80°
57°
1
79°
55°
2
70°
53°
3
71°
51°
4
76°
54°
5
80°
54°
6
69°
48°
7
68°
47°
8
70°
50°
9
73°
53°
10
78°
54°
11
78°
53°
12
77°
50°
13
65°
41°
14
74°
50°
15
75°
51°
16
75°
49°
17
74°
50°
18
76°
52°
19
77°
51°
20
75°
48°
21
74°
47°
22
74°
50°
23
75°
53°
24
76°
50°
25
74°
49°
26
72°
50°
27
72°
51°
28
74°
48°
29
62°
45°
30
63°
48°
1
65°
44°
2
59°
40°
3
56°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Polson
Polson's September 2026 forecast shows daily high temperatures ranging from 56° to 80°, with overnight lows between 40° and 57°. The average high for September is 72° with an average low of 50°. 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 Polson. See also: October | November | December.
