S
M
T
W
T
F
S
26
55°
32°
27
64°
31°
28
63°
31°
29
55°
32°
30
54°
38°
1
61°
44°
2
55°
44°
3
59°
43°
4
62°
48°
5
68°
52°
6
64°
54°
7
62°
47°
8
60°
44°
9
63°
50°
10
64°
50°
11
65°
53°
12
64°
50°
13
66°
52°
14
65°
50°
15
65°
53°
16
66°
51°
17
65°
48°
18
66°
55°
19
73°
55°
20
72°
54°
21
67°
56°
22
73°
53°
23
65°
52°
24
68°
53°
25
68°
52°
26
69°
53°
27
67°
54°
28
68°
58°
29
75°
58°
30
74°
57°
31
73°
57°
1
70°
52°
2
69°
52°
3
68°
53°
4
70°
52°
5
69°
53°
6
70°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Riverhead
Riverhead's May 2026 forecast shows daily high temperatures ranging from 55° to 75°, with overnight lows between 43° and 58°. The average high for May is 67° with an average low of 52°. 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 Riverhead. See also: June | July | August.
