S
M
T
W
T
F
S
26
63°
37°
27
60°
37°
28
52°
38°
29
46°
32°
30
43°
33°
1
44°
31°
2
54°
29°
3
63°
40°
4
62°
40°
5
40°
33°
6
42°
35°
7
50°
30°
8
59°
26°
9
54°
36°
10
47°
32°
11
50°
32°
12
49°
34°
13
59°
37°
14
65°
34°
15
84°
50°
16
74°
43°
17
49°
35°
18
66°
42°
19
51°
38°
20
51°
29°
21
53°
29°
22
57°
39°
23
62°
45°
24
73°
47°
25
85°
45°
26
76°
57°
27
N/A
28
66°
45°
29
76°
46°
30
64°
48°
31
72°
45°
1
68°
43°
2
75°
49°
3
78°
56°
4
69°
49°
5
71°
54°
6
67°
53°
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 64° to 78°, with overnight lows between 43° and 56°. The average high for May is 71° with an average low of 49°. 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.
