S
M
T
W
T
F
S
26
55°
32°
27
64°
31°
28
63°
31°
29
55°
32°
30
54°
38°
1
60°
32°
2
54°
42°
3
58°
31°
4
61°
30°
5
62°
52°
6
62°
54°
7
63°
35°
8
61°
32°
9
62°
44°
10
66°
43°
11
59°
35°
12
61°
37°
13
60°
50°
14
58°
48°
15
58°
47°
16
69°
55°
17
74°
53°
18
65°
54°
19
67°
57°
20
74°
52°
21
66°
50°
22
69°
52°
23
65°
52°
24
67°
50°
25
66°
49°
26
65°
58°
27
64°
52°
28
63°
50°
29
63°
51°
30
64°
56°
31
68°
55°
1
65°
54°
2
66°
53°
3
65°
53°
4
66°
51°
5
66°
56°
6
68°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Sag Harbor
Sag Harbor's May 2026 forecast shows daily high temperatures ranging from 58° to 74°, with overnight lows between 47° and 58°. The average high for May is 66° with an average low of 53°. 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 Sag Harbor. See also: June | July | August.
