S
M
T
W
T
F
S
26
55°
43°
27
58°
44°
28
52°
43°
29
50°
45°
30
56°
46°
1
65°
47°
2
55°
48°
3
56°
43°
4
69°
51°
5
75°
58°
6
68°
52°
7
60°
47°
8
59°
43°
9
61°
46°
10
60°
44°
11
62°
46°
12
64°
48°
13
64°
49°
14
63°
50°
15
67°
51°
16
66°
48°
17
71°
52°
18
72°
53°
19
72°
53°
20
67°
52°
21
68°
53°
22
68°
53°
23
69°
50°
24
65°
49°
25
67°
50°
26
67°
55°
27
68°
52°
28
68°
50°
29
69°
49°
30
68°
52°
31
69°
56°
1
72°
55°
2
71°
52°
3
70°
56°
4
74°
57°
5
71°
56°
6
71°
58°
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 56° to 75°, with overnight lows between 43° and 58°. The average high for May is 67° 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 Dorchester. See also: June | July | August.
