S
M
T
W
T
F
S
26
56°
41°
27
70°
36°
28
63°
44°
29
62°
50°
30
71°
47°
1
67°
40°
2
62°
49°
3
63°
43°
4
80°
45°
5
89°
58°
6
71°
60°
7
62°
50°
8
73°
42°
9
76°
52°
10
87°
49°
11
62°
47°
12
71°
40°
13
78°
55°
14
64°
53°
15
72°
52°
16
87°
51°
17
88°
58°
18
95°
63°
19
N/A
20
96°
66°
21
69°
58°
22
63°
53°
23
63°
58°
24
70°
58°
25
76°
61°
26
74°
61°
27
77°
60°
28
76°
59°
29
77°
63°
30
78°
62°
31
79°
63°
1
79°
61°
2
80°
59°
3
79°
63°
4
81°
64°
5
82°
65°
6
82°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Dorchester
Dorchester's May 2026 forecast shows daily high temperatures ranging from 63° to 96°, with overnight lows between 53° and 66°. The average high for May is 77° with an average low of 61°. 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.
