S
M
T
W
T
F
S
26
59°
38°
27
70°
32°
28
65°
36°
29
63°
41°
30
56°
42°
1
63°
34°
2
58°
45°
3
57°
36°
4
70°
34°
5
78°
50°
6
67°
54°
7
61°
39°
8
59°
44°
9
58°
48°
10
69°
45°
11
57°
37°
12
59°
39°
13
59°
49°
14
61°
47°
15
66°
48°
16
69°
53°
17
71°
52°
18
73°
53°
19
72°
55°
20
73°
57°
21
74°
50°
22
66°
47°
23
67°
48°
24
68°
51°
25
71°
55°
26
75°
55°
27
71°
54°
28
73°
51°
29
69°
49°
30
72°
56°
31
77°
57°
1
76°
57°
2
73°
56°
3
74°
55°
4
78°
58°
5
78°
58°
6
79°
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 79°, with overnight lows between 37° and 59°. The average high for May is 70° 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.
