S
M
T
W
T
F
S
30
87°
68°
31
86°
65°
1
83°
62°
2
87°
66°
3
87°
71°
4
90°
72°
5
81°
68°
6
73°
68°
7
80°
67°
8
84°
67°
9
79°
59°
10
79°
54°
11
84°
60°
12
72°
57°
13
70°
49°
14
62°
60°
15
72°
51°
16
73°
59°
17
73°
61°
18
74°
66°
19
73°
55°
20
66°
51°
21
68°
51°
22
69°
50°
23
67°
52°
24
69°
55°
25
71°
54°
26
75°
52°
27
73°
52°
28
67°
51°
29
67°
49°
30
68°
45°
1
69°
48°
2
65°
48°
3
68°
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 62° to 75°, with overnight lows between 45° and 66°. The average high for September is 69° with an average low of 53°. 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.
