S
M
T
W
T
F
S
26
55°
39°
27
65°
40°
28
63°
40°
29
60°
43°
30
58°
46°
1
62°
47°
2
57°
45°
3
59°
45°
4
63°
52°
5
69°
54°
6
63°
53°
7
60°
46°
8
58°
44°
9
59°
50°
10
61°
50°
11
63°
51°
12
62°
50°
13
60°
52°
14
63°
50°
15
63°
53°
16
64°
51°
17
64°
49°
18
65°
56°
19
71°
56°
20
70°
55°
21
66°
56°
22
72°
53°
23
64°
53°
24
66°
54°
25
67°
52°
26
66°
54°
27
65°
55°
28
67°
59°
29
74°
59°
30
72°
58°
31
72°
57°
1
69°
52°
2
67°
53°
3
67°
53°
4
69°
54°
5
68°
54°
6
69°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Ronkonkoma
Ronkonkoma's May 2026 forecast shows daily high temperatures ranging from 57° to 74°, with overnight lows between 44° and 59°. The average high for May is 65° 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 Ronkonkoma. See also: June | July | August.
