S
M
T
W
T
F
S
26
61°
38°
27
67°
32°
28
62°
34°
29
59°
45°
30
54°
45°
1
63°
43°
2
57°
46°
3
54°
37°
4
73°
53°
5
83°
51°
6
74°
57°
7
64°
44°
8
61°
34°
9
54°
33°
10
74°
49°
11
62°
37°
12
63°
35°
13
65°
38°
14
63°
52°
15
54°
44°
16
78°
42°
17
87°
56°
18
75°
52°
19
96°
59°
20
89°
68°
21
69°
48°
22
64°
40°
23
65°
44°
24
55°
52°
25
77°
53°
26
84°
61°
27
86°
58°
28
72°
48°
29
70°
52°
30
64°
46°
31
67°
48°
1
65°
49°
2
67°
48°
3
69°
52°
4
71°
55°
5
81°
59°
6
79°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Southborough
Southborough's May 2026 forecast shows daily high temperatures ranging from 64° to 86°, with overnight lows between 46° and 61°. The average high for May is 73° with an average low of 53°. 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 Southborough. See also: June | July | August.
