S
M
T
W
T
F
S
26
59°
40°
27
65°
43°
28
62°
40°
29
59°
39°
30
52°
42°
1
59°
39°
2
53°
43°
3
50°
37°
4
70°
49°
5
79°
56°
6
67°
53°
7
65°
44°
8
60°
42°
9
59°
45°
10
62°
44°
11
60°
45°
12
62°
46°
13
61°
47°
14
63°
48°
15
60°
47°
16
65°
48°
17
66°
47°
18
72°
52°
19
71°
51°
20
70°
51°
21
69°
50°
22
70°
51°
23
66°
45°
24
64°
47°
25
66°
46°
26
67°
53°
27
67°
49°
28
68°
48°
29
67°
47°
30
67°
49°
31
68°
55°
1
72°
53°
2
70°
50°
3
69°
54°
4
74°
56°
5
71°
54°
6
70°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Westborough
Westborough's May 2026 forecast shows daily high temperatures ranging from 59° to 79°, with overnight lows between 42° 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 Westborough. See also: June | July | August.
