S
M
T
W
T
F
S
26
54°
40°
27
54°
40°
28
55°
42°
29
54°
45°
30
56°
45°
1
56°
44°
2
57°
45°
3
55°
43°
4
55°
42°
5
54°
42°
6
56°
41°
7
55°
42°
8
56°
46°
9
57°
47°
10
60°
47°
11
59°
46°
12
57°
47°
13
57°
47°
14
58°
46°
15
57°
47°
16
57°
45°
17
56°
44°
18
57°
43°
19
56°
43°
20
57°
44°
21
58°
46°
22
62°
46°
23
60°
45°
24
63°
47°
25
64°
49°
26
62°
47°
27
63°
50°
28
64°
49°
29
65°
50°
30
66°
49°
31
66°
50°
1
65°
50°
2
66°
48°
3
65°
49°
4
66°
50°
5
66°
50°
6
65°
47°
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 54° to 66°, with overnight lows between 40° and 50°. The average high for May is 59° with an average low of 46°. 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.
