S
M
T
W
T
F
S
26
58°
38°
27
69°
37°
28
55°
48°
29
52°
42°
30
43°
37°
1
42°
30°
2
43°
28°
3
54°
28°
4
70°
42°
5
68°
49°
6
53°
40°
7
51°
34°
8
55°
35°
9
59°
44°
10
58°
38°
11
54°
32°
12
62°
29°
13
65°
41°
14
42°
39°
15
63°
41°
16
79°
59°
17
80°
59°
18
87°
65°
19
85°
65°
20
68°
36°
21
58°
36°
22
65°
44°
23
67°
46°
24
69°
51°
25
69°
50°
26
70°
48°
27
69°
48°
28
71°
49°
29
70°
45°
30
76°
51°
31
75°
50°
1
70°
49°
2
70°
51°
3
71°
51°
4
71°
50°
5
69°
49°
6
71°
52°
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 58° to 87°, with overnight lows between 36° and 65°. The average high for May is 72° 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 Belfast. See also: June | July | August.
