S
M
T
W
T
F
S
26
86°
63°
27
81°
63°
28
82°
54°
29
90°
63°
30
86°
70°
1
77°
57°
2
69°
48°
3
76°
49°
4
80°
52°
5
84°
59°
6
87°
67°
7
81°
55°
8
77°
50°
9
82°
55°
10
84°
62°
11
86°
63°
12
87°
63°
13
86°
62°
14
85°
60°
15
87°
64°
16
87°
64°
17
88°
63°
18
88°
64°
19
87°
64°
20
88°
65°
21
88°
65°
22
87°
64°
23
88°
66°
24
87°
66°
25
89°
65°
26
89°
67°
27
86°
66°
28
84°
67°
29
85°
67°
30
84°
66°
31
87°
67°
1
88°
67°
2
88°
68°
3
87°
68°
4
90°
69°
5
90°
68°
6
86°
67°
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 69° to 90°, with overnight lows between 48° and 69°. The average high for May is 85° with an average low of 63°. 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.
