S
M
T
W
T
F
S
26
74°
56°
27
81°
53°
28
78°
61°
29
68°
53°
30
63°
43°
1
63°
41°
2
58°
37°
3
66°
34°
4
80°
51°
5
70°
59°
6
63°
47°
7
64°
43°
8
73°
41°
9
78°
56°
10
77°
57°
11
74°
49°
12
78°
43°
13
76°
56°
14
68°
45°
15
75°
42°
16
87°
64°
17
89°
64°
18
89°
66°
19
91°
67°
20
74°
56°
21
72°
62°
22
76°
66°
23
78°
65°
24
78°
66°
25
77°
63°
26
78°
65°
27
82°
64°
28
84°
66°
29
81°
65°
30
84°
64°
31
82°
65°
1
81°
63°
2
80°
59°
3
80°
63°
4
77°
62°
5
78°
63°
6
81°
63°
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 72° to 84°, with overnight lows between 56° and 66°. The average high for May is 79° with an average low of 63°. 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.
