S
M
T
W
T
F
S
26
60°
34°
27
65°
34°
28
52°
40°
29
48°
42°
30
47°
43°
1
62°
38°
2
51°
37°
3
55°
40°
4
71°
39°
5
68°
47°
6
59°
51°
7
63°
43°
8
59°
36°
9
56°
36°
10
61°
47°
11
61°
42°
12
59°
37°
13
52°
36°
14
61°
47°
15
60°
48°
16
75°
55°
17
82°
48°
18
64°
50°
19
87°
66°
20
86°
50°
21
61°
41°
22
58°
41°
23
59°
45°
24
60°
46°
25
63°
48°
26
66°
51°
27
64°
52°
28
67°
50°
29
64°
47°
30
60°
50°
31
62°
51°
1
63°
48°
2
61°
48°
3
61°
49°
4
62°
52°
5
63°
53°
6
69°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Biddeford
Biddeford's May 2026 forecast shows daily high temperatures ranging from 58° to 87°, with overnight lows between 41° and 66°. The average high for May is 66° with an average low of 50°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Biddeford. See also: June | July | August.
