S
M
T
W
T
F
S
30
73°
61°
31
70°
62°
1
72°
61°
2
81°
62°
3
80°
57°
4
77°
54°
5
77°
51°
6
75°
51°
7
76°
47°
8
79°
50°
9
74°
61°
10
74°
48°
11
72°
43°
12
78°
64°
13
75°
47°
14
66°
44°
15
67°
60°
16
75°
53°
17
69°
49°
18
70°
46°
19
64°
44°
20
63°
41°
21
61°
43°
22
64°
47°
23
66°
47°
24
64°
46°
25
63°
42°
26
62°
46°
27
68°
46°
28
68°
46°
29
62°
45°
30
62°
45°
1
63°
46°
2
66°
44°
3
63°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Peterborough
Peterborough's September 2026 forecast shows daily high temperatures ranging from 61° to 78°, with overnight lows between 41° and 64°. The average high for September is 66° 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 Peterborough. See also: October | November | December.
