S
M
T
W
T
F
S
26
60°
43°
27
73°
41°
28
70°
50°
29
64°
47°
30
51°
42°
1
55°
34°
2
47°
34°
3
58°
34°
4
72°
48°
5
75°
59°
6
60°
46°
7
60°
41°
8
61°
41°
9
66°
48°
10
64°
47°
11
63°
42°
12
69°
41°
13
67°
47°
14
51°
43°
15
66°
42°
16
71°
46°
17
83°
60°
18
90°
68°
19
88°
66°
20
72°
47°
21
63°
49°
22
68°
56°
23
72°
60°
24
73°
61°
25
74°
60°
26
75°
60°
27
74°
57°
28
75°
58°
29
77°
59°
30
78°
55°
31
77°
60°
1
75°
60°
2
75°
61°
3
76°
60°
4
72°
58°
5
71°
56°
6
73°
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 63° to 90°, with overnight lows between 47° and 68°. The average high for May is 75° with an average low of 59°. 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.
