S
M
T
W
T
F
S
26
64°
46°
27
79°
37°
28
69°
51°
29
65°
52°
30
55°
37°
1
63°
35°
2
52°
33°
3
60°
32°
4
73°
44°
5
76°
53°
6
63°
51°
7
60°
41°
8
67°
35°
9
69°
50°
10
67°
47°
11
63°
41°
12
72°
38°
13
68°
45°
14
51°
40°
15
67°
36°
16
75°
42°
17
84°
55°
18
90°
55°
19
88°
64°
20
81°
58°
21
62°
52°
22
63°
53°
23
71°
54°
24
N/A
25
76°
59°
26
78°
63°
27
72°
59°
28
78°
49°
29
74°
52°
30
71°
49°
31
72°
53°
1
71°
50°
2
72°
51°
3
75°
56°
4
74°
58°
5
73°
57°
6
76°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Grafton
Grafton's May 2026 forecast shows daily high temperatures ranging from 71° to 78°, with overnight lows between 49° and 63°. The average high for May is 74° with an average low of 55°. 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.
