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
55°
35°
3
53°
32°
4
70°
35°
5
80°
54°
6
66°
45°
7
56°
36°
8
54°
31°
9
53°
32°
10
66°
44°
11
58°
35°
12
60°
32°
13
58°
39°
14
56°
49°
15
59°
48°
16
77°
47°
17
83°
56°
18
90°
51°
19
90°
62°
20
79°
56°
21
59°
42°
22
66°
36°
23
63°
43°
24
54°
47°
25
71°
47°
26
82°
57°
27
81°
52°
28
68°
47°
29
62°
44°
30
61°
42°
31
69°
45°
1
67°
45°
2
68°
48°
3
73°
51°
4
76°
55°
5
78°
56°
6
76°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in South Williamstown
South Williamstown's May 2026 forecast shows daily high temperatures ranging from 61° to 82°, with overnight lows between 42° and 57°. The average high for May is 72° with an average low of 50°. 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 South Williamstown. See also: June | July | August.
