S
M
T
W
T
F
S
26
68°
34°
27
75°
33°
28
72°
37°
29
69°
36°
30
53°
46°
1
60°
39°
2
55°
36°
3
53°
34°
4
72°
37°
5
83°
43°
6
62°
45°
7
59°
36°
8
58°
31°
9
50°
30°
10
67°
47°
11
59°
38°
12
61°
33°
13
49°
38°
14
55°
48°
15
63°
47°
16
79°
45°
17
85°
57°
18
89°
52°
19
91°
60°
20
84°
61°
21
64°
45°
22
68°
35°
23
67°
39°
24
52°
48°
25
75°
50°
26
85°
49°
27
80°
52°
28
66°
49°
29
66°
46°
30
58°
38°
31
67°
45°
1
64°
46°
2
64°
45°
3
70°
51°
4
74°
53°
5
78°
53°
6
75°
53°
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 58° to 80°, with overnight lows between 38° and 53°. The average high for May is 69° 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 Grafton. See also: June | July | August.
