S
M
T
W
T
F
S
26
63°
43°
27
64°
46°
28
55°
45°
29
61°
45°
30
66°
46°
1
77°
45°
2
68°
50°
3
61°
50°
4
54°
43°
5
57°
37°
6
52°
39°
7
57°
37°
8
64°
41°
9
64°
45°
10
54°
37°
11
52°
37°
12
59°
36°
13
N/A
14
49°
40°
15
54°
38°
16
55°
44°
17
56°
42°
18
58°
45°
19
63°
51°
20
68°
52°
21
70°
54°
22
69°
53°
23
66°
51°
24
65°
50°
25
66°
51°
26
60°
48°
27
60°
45°
28
59°
44°
29
59°
45°
30
60°
49°
31
61°
50°
1
64°
51°
2
67°
52°
3
68°
53°
4
69°
52°
5
67°
52°
6
67°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Boston
Boston's May 2026 forecast shows daily high temperatures ranging from 49° to 70°, with overnight lows between 38° and 54°. The average high for May is 63° with an average low of 48°. 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.
