S
M
T
W
T
F
S
31
70°
54°
1
66°
54°
2
66°
54°
3
64°
53°
4
62°
49°
5
61°
49°
6
62°
52°
7
65°
54°
8
63°
52°
9
65°
50°
10
66°
49°
11
70°
53°
12
74°
52°
13
73°
53°
14
74°
54°
15
63°
48°
16
64°
53°
17
64°
51°
18
63°
48°
19
63°
48°
20
64°
49°
21
66°
53°
22
66°
54°
23
65°
53°
24
66°
54°
25
65°
51°
26
64°
51°
27
65°
50°
28
64°
49°
29
65°
54°
30
66°
53°
1
66°
52°
2
67°
55°
3
66°
53°
4
66°
50°
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 61° to 74°, with overnight lows between 48° and 55°. The average high for June 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 June weather will actually feel in Alton. See also: July | August | September.
