S
M
T
W
T
F
S
26
53°
38°
27
66°
37°
28
60°
38°
29
59°
48°
30
56°
44°
1
61°
42°
2
55°
43°
3
57°
40°
4
61°
48°
5
61°
48°
6
62°
55°
7
63°
52°
8
62°
48°
9
62°
47°
10
61°
49°
11
65°
49°
12
64°
48°
13
60°
49°
14
61°
47°
15
61°
52°
16
62°
50°
17
61°
49°
18
62°
54°
19
64°
54°
20
65°
53°
21
64°
54°
22
70°
51°
23
62°
51°
24
64°
55°
25
66°
52°
26
64°
53°
27
63°
53°
28
65°
57°
29
68°
57°
30
69°
56°
31
66°
55°
1
66°
51°
2
65°
51°
3
66°
52°
4
66°
52°
5
67°
53°
6
66°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Mystic
Mystic's May 2026 forecast shows daily high temperatures ranging from 55° to 70°, with overnight lows between 40° and 57°. The average high for May is 63° 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 Mystic. See also: June | July | August.
