S
M
T
W
T
F
S
30
73°
47°
31
73°
50°
1
78°
46°
2
75°
52°
3
81°
53°
4
82°
55°
5
83°
52°
6
81°
46°
7
69°
53°
8
77°
51°
9
67°
51°
10
70°
52°
11
69°
53°
12
74°
52°
13
68°
52°
14
77°
47°
15
66°
39°
16
64°
40°
17
Hist. Avg.
70°
38°
18
Hist. Avg.
70°
38°
19
Hist. Avg.
69°
38°
20
Hist. Avg.
69°
37°
21
Hist. Avg.
68°
37°
22
Hist. Avg.
68°
37°
23
Hist. Avg.
67°
36°
24
Hist. Avg.
67°
36°
25
Hist. Avg.
66°
36°
26
Hist. Avg.
66°
35°
27
Hist. Avg.
65°
35°
28
Hist. Avg.
65°
35°
29
Hist. Avg.
64°
34°
30
Hist. Avg.
64°
34°
1
Hist. Avg.
63°
34°
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
*Temporarily Unavailable
September Weather in Polson
Polson's September 2026 forecast shows daily high temperatures ranging from 64° to 83°, with overnight lows between 39° and 55°. The average high for September is 74° 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.
