S
M
T
W
T
F
S
26
67°
29°
27
73°
31°
28
67°
33°
29
64°
42°
30
50°
43°
1
57°
32°
2
48°
32°
3
51°
30°
4
70°
29°
5
82°
37°
6
62°
46°
7
59°
33°
8
55°
28°
9
53°
27°
10
65°
41°
11
58°
34°
12
56°
29°
13
44°
32°
14
54°
43°
15
60°
49°
16
77°
47°
17
80°
52°
18
77°
46°
19
88°
49°
20
83°
58°
21
63°
40°
22
68°
32°
23
66°
35°
24
50°
46°
25
72°
48°
26
83°
46°
27
81°
51°
28
63°
47°
29
62°
43°
30
54°
35°
31
62°
47°
1
61°
41°
2
63°
43°
3
68°
44°
4
75°
48°
5
76°
54°
6
73°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Dorchester
Dorchester's May 2026 forecast shows daily high temperatures ranging from 54° to 76°, with overnight lows between 35° and 54°. The average high for May is 66° with an average low of 46°. 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 Dorchester. See also: June | July | August.
