S
M
T
W
T
F
S
26
55°
39°
27
65°
40°
28
63°
40°
29
60°
43°
30
58°
46°
1
63°
48°
2
58°
42°
3
59°
45°
4
64°
53°
5
70°
55°
6
61°
49°
7
62°
42°
8
58°
43°
9
60°
49°
10
61°
50°
11
63°
50°
12
60°
49°
13
60°
49°
14
63°
50°
15
63°
53°
16
64°
51°
17
64°
48°
18
65°
55°
19
72°
55°
20
71°
54°
21
67°
56°
22
72°
53°
23
65°
52°
24
66°
53°
25
67°
52°
26
67°
53°
27
66°
54°
28
68°
58°
29
74°
58°
30
73°
57°
31
72°
57°
1
69°
52°
2
68°
52°
3
67°
53°
4
69°
52°
5
68°
53°
6
69°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Smithtown
Smithtown's May 2026 forecast shows daily high temperatures ranging from 58° to 74°, with overnight lows between 42° and 58°. The average high for May is 66° 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 Smithtown. See also: June | July | August.
