S
M
T
W
T
F
S
26
48°
38°
27
48°
38°
28
50°
32°
29
64°
31°
30
N/A
1
54°
33°
2
70°
44°
3
68°
45°
4
67°
37°
5
56°
36°
6
53°
33°
7
67°
47°
8
77°
44°
9
68°
47°
10
68°
46°
11
67°
46°
12
68°
47°
13
70°
46°
14
69°
45°
15
62°
48°
16
63°
50°
17
67°
51°
18
72°
52°
19
72°
52°
20
73°
53°
21
69°
46°
22
64°
44°
23
65°
45°
24
64°
45°
25
64°
47°
26
65°
46°
27
65°
48°
28
67°
45°
29
70°
56°
30
79°
54°
31
69°
57°
1
80°
58°
2
76°
58°
3
76°
57°
4
73°
58°
5
73°
58°
6
72°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in O'Neill
O'Neill's May 2026 forecast shows daily high temperatures ranging from 53° to 80°, with overnight lows between 33° and 58°. The average high for May is 68° with an average low of 48°. 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 O'Neill. See also: June | July | August.
