S
M
T
W
T
F
S
30
74°
58°
31
75°
59°
1
72°
53°
2
79°
60°
3
81°
58°
4
83°
54°
5
77°
49°
6
77°
49°
7
76°
57°
8
79°
53°
9
79°
47°
10
70°
46°
11
69°
45°
12
69°
46°
13
70°
51°
14
69°
44°
15
68°
42°
16
66°
41°
17
66°
42°
18
67°
42°
19
66°
43°
20
66°
43°
21
67°
47°
22
70°
51°
23
72°
43°
24
74°
51°
25
72°
49°
26
73°
39°
27
64°
48°
28
65°
48°
29
66°
45°
30
65°
45°
1
64°
42°
2
60°
40°
3
61°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Peter
St. Peter's September 2026 forecast shows daily high temperatures ranging from 60° to 83°, with overnight lows between 39° and 60°. The average high for September is 71° with an average low of 48°. 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. Peter. See also: October | November | December.
