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
80°
65°
23
74°
53°
24
81°
55°
25
84°
64°
26
79°
68°
27
72°
63°
28
79°
65°
29
84°
66°
30
88°
65°
1
86°
67°
2
83°
65°
3
79°
66°
4
79°
63°
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 72° to 88°, with overnight lows between 53° and 68°. The average high for June is 81° with an average low of 63°. 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.
