S
M
T
W
T
F
S
26
52°
37°
27
53°
37°
28
53°
40°
29
54°
44°
30
58°
44°
1
56°
43°
2
56°
43°
3
54°
40°
4
53°
39°
5
53°
39°
6
54°
40°
7
54°
39°
8
55°
43°
9
57°
45°
10
60°
44°
11
60°
45°
12
55°
42°
13
56°
44°
14
56°
42°
15
57°
44°
16
56°
42°
17
55°
41°
18
55°
41°
19
56°
42°
20
55°
41°
21
57°
41°
22
62°
44°
23
60°
44°
24
61°
46°
25
61°
46°
26
59°
45°
27
61°
47°
28
61°
47°
29
63°
48°
30
64°
46°
31
64°
47°
1
63°
46°
2
63°
46°
3
64°
47°
4
65°
48°
5
63°
48°
6
64°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Donegal
Donegal's May 2026 forecast shows daily high temperatures ranging from 52° to 65°, with overnight lows between 37° and 48°. The average high for May is 58° with an average low of 43°. 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 Donegal. See also: June | July | August.
