S
M
T
W
T
F
S
26
56°
41°
27
54°
41°
28
53°
43°
29
55°
44°
30
55°
44°
1
57°
44°
2
55°
43°
3
54°
44°
4
56°
43°
5
54°
42°
6
55°
42°
7
55°
45°
8
56°
45°
9
57°
44°
10
55°
45°
11
56°
44°
12
56°
46°
13
57°
46°
14
56°
45°
15
56°
45°
16
57°
46°
17
56°
45°
18
62°
46°
19
63°
47°
20
60°
47°
21
62°
46°
22
59°
47°
23
60°
47°
24
61°
45°
25
64°
45°
26
62°
48°
27
64°
44°
28
64°
47°
29
65°
48°
30
65°
45°
31
64°
43°
1
62°
44°
2
63°
45°
3
62°
44°
4
61°
49°
5
63°
48°
6
65°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Portlaoise
Portlaoise's May 2026 forecast shows daily high temperatures ranging from 53° to 65°, with overnight lows between 41° and 49°. The average high for May is 59° 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 Portlaoise. See also: June | July | August.
