S
M
T
W
T
F
S
26
55°
37°
27
52°
33°
28
54°
34°
29
54°
34°
30
55°
32°
1
55°
33°
2
54°
34°
3
55°
38°
4
56°
35°
5
55°
35°
6
56°
36°
7
57°
37°
8
59°
37°
9
58°
35°
10
56°
37°
11
57°
37°
12
59°
46°
13
62°
42°
14
59°
43°
15
60°
46°
16
69°
44°
17
61°
43°
18
63°
43°
19
66°
50°
20
72°
48°
21
72°
44°
22
62°
42°
23
63°
44°
24
64°
44°
25
66°
44°
26
74°
50°
27
75°
46°
28
74°
51°
29
70°
51°
30
71°
50°
31
67°
46°
1
72°
43°
2
67°
42°
3
65°
43°
4
65°
49°
5
68°
52°
6
72°
53°
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 52° to 75°, with overnight lows between 32° and 53°. The average high for May is 63° with an average low of 42°. 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.
