S
M
T
W
T
F
S
30
82°
63°
31
77°
63°
1
77°
56°
2
80°
53°
3
83°
55°
4
79°
57°
5
71°
48°
6
76°
58°
7
80°
56°
8
71°
51°
9
59°
43°
10
60°
44°
11
58°
48°
12
55°
47°
13
58°
46°
14
59°
48°
15
57°
45°
16
58°
46°
17
57°
45°
18
62°
50°
19
62°
51°
20
59°
48°
21
54°
44°
22
58°
44°
23
60°
50°
24
60°
48°
25
61°
50°
26
60°
50°
27
58°
46°
28
57°
45°
29
52°
44°
30
55°
43°
1
52°
42°
2
48°
41°
3
47°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sankt Peter
Sankt Peter's September 2026 forecast shows daily high temperatures ranging from 47° to 80°, with overnight lows between 41° and 58°. The average high for September is 60° with an average low of 47°. 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 Sankt Peter. See also: October | November | December.
