S
M
T
W
T
F
S
31
79°
48°
1
75°
48°
2
77°
48°
3
81°
46°
4
84°
50°
5
84°
54°
6
84°
63°
7
88°
66°
8
91°
63°
9
84°
66°
10
82°
70°
11
90°
68°
12
88°
66°
13
84°
61°
14
84°
61°
15
72°
55°
16
75°
50°
17
82°
57°
18
77°
64°
19
75°
61°
20
77°
57°
21
81°
57°
22
82°
64°
23
77°
57°
24
79°
50°
25
84°
55°
26
79°
66°
27
73°
66°
28
86°
68°
29
87°
68°
30
93°
72°
1
97°
70°
2
96°
70°
3
98°
70°
4
87°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Alton
Alton's June 2026 forecast shows daily high temperatures ranging from 87° to 98°, with overnight lows between 68° and 72°. The average high for June is 93° 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 Alton. See also: July | August | September.
