S
M
T
W
T
F
S
26
57°
38°
27
56°
34°
28
65°
45°
29
53°
39°
30
57°
35°
1
54°
32°
2
47°
33°
3
62°
33°
4
75°
50°
5
66°
48°
6
51°
36°
7
54°
36°
8
60°
38°
9
67°
43°
10
58°
38°
11
59°
36°
12
53°
31°
13
63°
44°
14
53°
45°
15
67°
48°
16
71°
55°
17
71°
56°
18
83°
70°
19
77°
57°
20
70°
46°
21
57°
44°
22
62°
46°
23
62°
50°
24
67°
54°
25
69°
56°
26
70°
56°
27
71°
46°
28
64°
51°
29
67°
52°
30
73°
48°
31
64°
43°
1
63°
44°
2
63°
44°
3
65°
45°
4
66°
48°
5
70°
54°
6
76°
56°
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 83°, with overnight lows between 43° and 70°. The average high for May is 68° with an average low of 51°. 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.
