S
M
T
W
T
F
S
26
64°
45°
27
73°
45°
28
68°
54°
29
63°
43°
30
55°
37°
1
52°
37°
2
52°
34°
3
59°
34°
4
72°
41°
5
64°
45°
6
54°
41°
7
57°
36°
8
63°
43°
9
70°
52°
10
64°
52°
11
68°
41°
12
73°
39°
13
63°
45°
14
63°
37°
15
63°
41°
16
70°
54°
17
82°
59°
18
84°
63°
19
82°
63°
20
66°
50°
21
66°
50°
22
61°
52°
23
64°
59°
24
70°
56°
25
77°
56°
26
76°
65°
27
74°
61°
28
79°
56°
29
76°
56°
30
73°
55°
31
74°
55°
1
76°
56°
2
76°
52°
3
77°
58°
4
78°
58°
5
80°
59°
6
79°
57°
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 70° to 80°, with overnight lows between 52° and 65°. The average high for May is 76° with an average low of 57°. 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.
