S
M
T
W
T
F
S
26
78°
51°
27
76°
51°
28
74°
50°
29
70°
48°
30
70°
49°
1
69°
48°
2
70°
45°
3
74°
53°
4
70°
53°
5
76°
54°
6
76°
54°
7
73°
51°
8
76°
55°
9
80°
55°
10
80°
57°
11
81°
56°
12
82°
57°
13
81°
58°
14
83°
56°
15
81°
56°
16
80°
57°
17
81°
58°
18
82°
59°
19
83°
58°
20
82°
52°
21
74°
51°
22
75°
56°
23
77°
53°
24
81°
59°
25
84°
60°
26
85°
62°
27
85°
61°
28
84°
62°
29
85°
62°
30
84°
61°
31
82°
63°
1
86°
60°
2
85°
61°
3
85°
61°
4
86°
62°
5
81°
60°
6
82°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in South Boston
South Boston's May 2026 forecast shows daily high temperatures ranging from 69° to 86°, with overnight lows between 45° and 63°. The average high for May is 79° with an average low of 56°. 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 Boston. See also: June | July | August.
