S
M
T
W
T
F
S
26
66°
37°
27
74°
33°
28
71°
40°
29
69°
48°
30
53°
44°
1
58°
42°
2
53°
32°
3
53°
34°
4
70°
37°
5
81°
54°
6
62°
44°
7
56°
33°
8
54°
30°
9
54°
30°
10
64°
43°
11
57°
32°
12
60°
30°
13
58°
40°
14
56°
48°
15
61°
46°
16
77°
41°
17
83°
55°
18
89°
52°
19
86°
63°
20
76°
53°
21
60°
41°
22
66°
35°
23
63°
42°
24
55°
48°
25
71°
49°
26
79°
44°
27
77°
51°
28
64°
46°
29
65°
44°
30
56°
37°
31
65°
46°
1
63°
47°
2
64°
49°
3
67°
52°
4
72°
56°
5
76°
54°
6
72°
56°
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 56° to 77°, with overnight lows between 37° and 56°. The average high for May is 67° with an average low of 49°. 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.
