S
M
T
W
T
F
S
30
79°
56°
31
76°
53°
1
72°
53°
2
66°
60°
3
66°
61°
4
80°
63°
5
75°
58°
6
74°
53°
7
82°
50°
8
79°
57°
9
67°
51°
10
85°
65°
11
75°
43°
12
70°
58°
13
68°
61°
14
77°
47°
15
66°
51°
16
71°
55°
17
72°
54°
18
71°
53°
19
68°
49°
20
64°
47°
21
66°
45°
22
67°
45°
23
65°
48°
24
69°
45°
25
60°
41°
26
60°
44°
27
61°
49°
28
63°
48°
29
59°
46°
30
60°
46°
1
60°
48°
2
63°
47°
3
65°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Biddeford
Biddeford's September 2026 forecast shows daily high temperatures ranging from 59° to 77°, with overnight lows between 41° and 61°. The average high for September is 66° 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 Biddeford. See also: October | November | December.
