S
M
T
W
T
F
S
31
73°
43°
1
69°
46°
2
74°
55°
3
79°
58°
4
82°
62°
5
87°
66°
6
87°
65°
7
75°
59°
8
72°
60°
9
73°
59°
10
77°
59°
11
74°
61°
12
80°
62°
13
78°
63°
14
79°
60°
15
75°
56°
16
72°
56°
17
72°
57°
18
74°
59°
19
75°
60°
20
77°
59°
21
75°
59°
22
74°
60°
23
74°
63°
24
75°
65°
25
76°
62°
26
75°
60°
27
76°
66°
28
82°
67°
29
78°
65°
30
77°
62°
1
76°
62°
2
77°
64°
3
78°
68°
4
81°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Smithtown
Smithtown's June 2026 forecast shows daily high temperatures ranging from 69° to 87°, with overnight lows between 46° and 69°. The average high for June is 77° with an average low of 61°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how June weather will actually feel in Smithtown. See also: July | August | September.
