S
M
T
W
T
F
S
30
81°
54°
31
77°
53°
1
67°
60°
2
71°
60°
3
78°
59°
4
80°
56°
5
74°
54°
6
70°
48°
7
77°
47°
8
76°
51°
9
75°
53°
10
82°
59°
11
73°
48°
12
73°
59°
13
72°
59°
14
71°
42°
15
70°
50°
16
76°
55°
17
80°
57°
18
73°
56°
19
70°
48°
20
67°
46°
21
66°
44°
22
65°
48°
23
66°
47°
24
67°
46°
25
67°
44°
26
61°
43°
27
62°
50°
28
70°
50°
29
69°
47°
30
62°
44°
1
61°
46°
2
63°
48°
3
67°
48°
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 80°, with overnight lows between 42° and 59°. The average high for September is 68° with an average low of 49°. 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.
