S
M
T
W
T
F
S
26
55°
39°
27
65°
40°
28
63°
40°
29
60°
43°
30
58°
46°
1
63°
40°
2
59°
49°
3
59°
43°
4
65°
46°
5
67°
53°
6
62°
56°
7
64°
45°
8
64°
44°
9
62°
48°
10
67°
52°
11
60°
45°
12
65°
46°
13
65°
51°
14
61°
50°
15
61°
48°
16
72°
56°
17
79°
59°
18
74°
59°
19
79°
64°
20
81°
59°
21
69°
52°
22
68°
52°
23
68°
53°
24
70°
56°
25
71°
58°
26
72°
59°
27
76°
54°
28
67°
52°
29
68°
54°
30
69°
59°
31
75°
58°
1
69°
56°
2
70°
55°
3
69°
55°
4
70°
53°
5
71°
60°
6
74°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in South Setauket
South Setauket's May 2026 forecast shows daily high temperatures ranging from 61° to 81°, with overnight lows between 48° and 64°. The average high for May is 71° with an average low of 56°. 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 South Setauket. See also: June | July | August.
