S
M
T
W
T
F
S
31
73°
43°
1
68°
47°
2
78°
46°
3
81°
56°
4
82°
52°
5
88°
56°
6
82°
61°
7
84°
66°
8
73°
57°
9
76°
55°
10
76°
63°
11
92°
66°
12
94°
72°
13
86°
67°
14
87°
65°
15
78°
59°
16
74°
55°
17
76°
62°
18
87°
67°
19
82°
69°
20
82°
66°
21
82°
58°
22
74°
61°
23
72°
64°
24
83°
62°
25
81°
59°
26
83°
70°
27
76°
66°
28
82°
65°
29
86°
67°
30
84°
72°
1
89°
73°
2
94°
75°
3
89°
70°
4
81°
68°
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 76° to 94°, with overnight lows between 65° and 75°. The average high for June is 85° with an average low of 70°. 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.
