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°
50°
8
77°
52°
9
77°
66°
10
79°
54°
11
72°
46°
12
75°
55°
13
79°
58°
14
78°
54°
15
72°
55°
16
71°
53°
17
72°
49°
18
69°
49°
19
71°
53°
20
70°
38°
21
65°
52°
22
63°
52°
23
64°
51°
24
67°
51°
25
68°
50°
26
70°
48°
27
63°
45°
28
65°
47°
29
70°
50°
30
70°
50°
1
69°
49°
2
68°
50°
3
67°
49°
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 63° to 79°, with overnight lows between 38° and 66°. The average high for September is 71° with an average low of 51°. 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.
