S
M
T
W
T
F
S
26
52°
39°
27
51°
38°
28
53°
38°
29
52°
36°
30
55°
36°
1
56°
43°
2
64°
40°
3
56°
37°
4
53°
36°
5
54°
34°
6
55°
35°
7
56°
39°
8
54°
39°
9
57°
36°
10
55°
36°
11
60°
39°
12
59°
39°
13
59°
37°
14
60°
38°
15
59°
37°
16
59°
38°
17
61°
48°
18
67°
47°
19
62°
45°
20
62°
41°
21
65°
45°
22
65°
40°
23
64°
43°
24
69°
42°
25
70°
48°
26
73°
50°
27
72°
49°
28
75°
50°
29
75°
51°
30
74°
50°
31
67°
51°
1
67°
51°
2
68°
52°
3
68°
47°
4
75°
45°
5
75°
54°
6
77°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Grafton
Grafton's May 2026 forecast shows daily high temperatures ranging from 51° to 77°, with overnight lows between 34° and 54°. The average high for May is 63° 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 Grafton. See also: June | July | August.
