S
M
T
W
T
F
S
26
64°
41°
27
68°
45°
28
57°
45°
29
68°
43°
30
72°
50°
1
61°
50°
2
59°
50°
3
59°
48°
4
57°
52°
5
59°
50°
6
57°
46°
7
59°
48°
8
59°
49°
9
62°
48°
10
58°
44°
11
56°
46°
12
58°
47°
13
56°
43°
14
55°
42°
15
56°
46°
16
56°
45°
17
58°
46°
18
58°
46°
19
59°
47°
20
54°
52°
21
55°
51°
22
54°
52°
23
55°
53°
24
55°
53°
25
56°
52°
26
58°
53°
27
57°
53°
28
55°
51°
29
56°
54°
30
56°
54°
31
57°
53°
1
59°
55°
2
61°
54°
3
61°
54°
4
62°
55°
5
62°
55°
6
61°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Merrion
Merrion's May 2026 forecast shows daily high temperatures ranging from 54° to 62°, with overnight lows between 42° and 55°. The average high for May is 58° 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 Merrion. See also: June | July | August.
