S
M
T
W
T
F
S
26
52°
40°
27
51°
41°
28
52°
41°
29
53°
45°
30
57°
45°
1
56°
46°
2
56°
45°
3
53°
42°
4
52°
41°
5
52°
41°
6
54°
42°
7
53°
41°
8
54°
45°
9
56°
47°
10
59°
47°
11
59°
46°
12
55°
45°
13
55°
47°
14
56°
44°
15
56°
46°
16
55°
44°
17
54°
43°
18
54°
43°
19
55°
44°
20
54°
43°
21
56°
44°
22
59°
45°
23
57°
45°
24
60°
48°
25
61°
48°
26
58°
47°
27
60°
49°
28
61°
49°
29
62°
50°
30
63°
48°
31
63°
49°
1
62°
49°
2
63°
48°
3
63°
50°
4
64°
49°
5
63°
50°
6
62°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Portrush
Portrush's May 2026 forecast shows daily high temperatures ranging from 51° to 64°, with overnight lows between 40° and 50°. The average high for May is 57° with an average low of 45°. 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 Portrush. See also: June | July | August.
