S
M
T
W
T
F
S
30
78°
57°
31
74°
57°
1
80°
58°
2
80°
56°
3
78°
57°
4
78°
57°
5
76°
56°
6
77°
55°
7
76°
53°
8
75°
54°
9
76°
54°
10
76°
53°
11
75°
53°
12
70°
46°
13
71°
45°
14
66°
48°
15
69°
49°
16
72°
48°
17
72°
50°
18
73°
51°
19
73°
52°
20
72°
51°
21
72°
50°
22
71°
50°
23
72°
51°
24
72°
51°
25
71°
50°
26
69°
50°
27
71°
49°
28
71°
50°
29
70°
46°
30
70°
41°
1
64°
40°
2
62°
41°
3
63°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Polten
St. Polten's September 2026 forecast shows daily high temperatures ranging from 62° to 80°, with overnight lows between 40° and 58°. The average high for September is 72° with an average low of 51°. 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 St. Polten. See also: October | November | December.
