S
M
T
W
T
F
S
30
N/A
31
87°
79°
1
91°
79°
2
91°
78°
3
91°
78°
4
91°
79°
5
92°
80°
6
90°
78°
7
89°
77°
8
90°
78°
9
91°
79°
10
88°
79°
11
87°
80°
12
87°
80°
13
87°
80°
14
87°
79°
15
88°
79°
16
87°
78°
17
86°
79°
18
86°
80°
19
87°
80°
20
88°
79°
21
86°
79°
22
86°
78°
23
87°
79°
24
86°
79°
25
86°
78°
26
86°
78°
27
86°
79°
28
86°
79°
29
88°
78°
30
86°
79°
1
86°
79°
2
86°
78°
3
86°
79°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Saint Peter
Saint Peter's September 2026 forecast shows daily high temperatures ranging from 86° to 92°, with overnight lows between 77° and 80°. The average high for September is 88° with an average low of 79°. 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 Saint Peter. See also: October | November | December.
