S
M
T
W
T
F
S
26
55°
48°
27
53°
45°
28
54°
46°
29
55°
47°
30
56°
46°
1
56°
50°
2
58°
47°
3
56°
43°
4
56°
44°
5
57°
43°
6
57°
43°
7
59°
46°
8
60°
51°
9
62°
51°
10
63°
47°
11
59°
45°
12
59°
46°
13
58°
46°
14
59°
48°
15
60°
47°
16
61°
48°
17
61°
48°
18
62°
52°
19
63°
49°
20
62°
50°
21
64°
52°
22
66°
53°
23
65°
56°
24
65°
57°
25
71°
56°
26
70°
56°
27
65°
57°
28
73°
59°
29
75°
52°
30
69°
53°
31
66°
53°
1
65°
52°
2
69°
53°
3
70°
59°
4
76°
59°
5
77°
60°
6
76°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Boston
Boston's May 2026 forecast shows daily high temperatures ranging from 53° to 77°, with overnight lows between 43° and 60°. The average high for May is 63° 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 Boston. See also: June | July | August.
