S
M
T
W
T
F
S
30
67°
50°
31
72°
51°
1
80°
53°
2
83°
63°
3
84°
63°
4
82°
56°
5
90°
58°
6
90°
60°
7
72°
57°
8
73°
53°
9
N/A
10
63°
52°
11
67°
52°
12
70°
54°
13
74°
56°
14
80°
63°
15
75°
55°
16
63°
52°
17
68°
52°
18
71°
53°
19
80°
61°
20
80°
62°
21
78°
59°
22
73°
56°
23
71°
56°
24
67°
56°
25
67°
57°
26
69°
57°
27
70°
56°
28
74°
58°
29
74°
57°
30
72°
58°
1
68°
57°
2
70°
59°
3
71°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in St Peters
St Peters's September 2026 forecast shows daily high temperatures ranging from 63° to 80°, with overnight lows between 52° and 63°. The average high for September is 71° with an average low of 57°. 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 Peters. See also: October | November | December.
