S
M
T
W
T
F
S
26
55°
43°
27
58°
44°
28
52°
43°
29
50°
45°
30
56°
46°
1
65°
47°
2
55°
48°
3
55°
44°
4
73°
46°
5
78°
57°
6
68°
49°
7
66°
46°
8
61°
46°
9
60°
51°
10
69°
55°
11
59°
46°
12
57°
46°
13
61°
50°
14
65°
52°
15
63°
53°
16
65°
52°
17
64°
53°
18
63°
51°
19
69°
54°
20
65°
55°
21
65°
55°
22
66°
54°
23
66°
52°
24
62°
51°
25
64°
51°
26
65°
57°
27
66°
54°
28
65°
52°
29
66°
51°
30
65°
54°
31
67°
58°
1
70°
57°
2
69°
54°
3
68°
58°
4
71°
59°
5
68°
58°
6
69°
59°
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 57° to 78°, with overnight lows between 46° and 59°. The average high for May is 66° with an average low of 53°. 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.
