S
M
T
W
T
F
S
26
63°
51°
27
68°
48°
28
72°
39°
29
76°
51°
30
72°
53°
1
56°
51°
2
54°
41°
3
68°
45°
4
78°
55°
5
83°
57°
6
84°
66°
7
75°
49°
8
69°
47°
9
72°
54°
10
74°
51°
11
75°
57°
12
74°
56°
13
74°
56°
14
78°
61°
15
79°
58°
16
74°
56°
17
76°
58°
18
78°
61°
19
78°
62°
20
82°
63°
21
80°
63°
22
76°
57°
23
75°
56°
24
74°
57°
25
76°
59°
26
78°
60°
27
76°
58°
28
76°
58°
29
77°
60°
30
77°
61°
31
78°
62°
1
78°
66°
2
82°
65°
3
79°
66°
4
80°
66°
5
81°
65°
6
82°
67°
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 84°, with overnight lows between 41° and 67°. The average high for May is 76° with an average low of 58°. 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.
