S
M
T
W
T
F
S
26
65°
38°
27
72°
31°
28
70°
40°
29
68°
46°
30
55°
46°
1
59°
43°
2
54°
35°
3
52°
39°
4
64°
48°
5
75°
54°
6
64°
50°
7
57°
37°
8
52°
37°
9
56°
42°
10
60°
44°
11
61°
43°
12
60°
44°
13
58°
43°
14
61°
42°
15
64°
42°
16
63°
41°
17
63°
40°
18
64°
49°
19
67°
49°
20
70°
48°
21
72°
50°
22
71°
46°
23
63°
45°
24
65°
46°
25
65°
43°
26
66°
45°
27
66°
47°
28
65°
49°
29
69°
52°
30
70°
50°
31
71°
45°
1
67°
44°
2
66°
44°
3
67°
46°
4
67°
46°
5
68°
47°
6
68°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Williamstown
Williamstown's May 2026 forecast shows daily high temperatures ranging from 52° to 75°, with overnight lows between 35° and 54°. The average high for May is 64° with an average low of 45°. 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 Williamstown. See also: June | July | August.
