S
M
T
W
T
F
S
26
60°
46°
27
70°
45°
28
60°
49°
29
62°
53°
30
70°
50°
1
67°
45°
2
62°
50°
3
64°
43°
4
78°
50°
5
87°
58°
6
74°
60°
7
66°
54°
8
74°
51°
9
73°
56°
10
83°
54°
11
65°
53°
12
68°
49°
13
78°
56°
14
63°
54°
15
73°
54°
16
86°
55°
17
88°
66°
18
95°
67°
19
99°
70°
20
97°
71°
21
72°
58°
22
61°
50°
23
55°
50°
24
65°
54°
25
74°
61°
26
77°
65°
27
82°
69°
28
82°
63°
29
81°
59°
30
69°
49°
31
75°
53°
1
77°
53°
2
73°
53°
3
77°
55°
4
82°
62°
5
85°
67°
6
82°
66°
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 69° to 85°, with overnight lows between 49° and 67°. The average high for May is 78° with an average low of 57°. 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.
