S
M
T
W
T
F
S
26
66°
37°
27
59°
43°
28
55°
43°
29
63°
39°
30
66°
41°
1
68°
46°
2
68°
46°
3
72°
48°
4
79°
50°
5
64°
48°
6
59°
46°
7
63°
46°
8
61°
46°
9
64°
48°
10
64°
48°
11
66°
45°
12
75°
46°
13
57°
50°
14
59°
48°
15
54°
45°
16
57°
43°
17
63°
45°
18
64°
48°
19
63°
46°
20
64°
45°
21
70°
45°
22
72°
48°
23
64°
48°
24
70°
48°
25
61°
52°
26
63°
50°
27
70°
46°
28
78°
52°
29
61°
44°
30
62°
43°
31
65°
42°
1
70°
49°
2
77°
55°
3
68°
49°
4
68°
50°
5
67°
48°
6
65°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Belfast
Belfast's May 2026 forecast shows daily high temperatures ranging from 61° to 78°, with overnight lows between 42° and 55°. The average high for May is 68° with an average low of 48°. 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 Belfast. See also: June | July | August.
