S
M
T
W
T
F
S
31
64°
51°
1
64°
51°
2
65°
50°
3
65°
51°
4
63°
50°
5
62°
50°
6
60°
49°
7
60°
47°
8
65°
52°
9
66°
53°
10
67°
53°
11
67°
52°
12
65°
52°
13
66°
51°
14
67°
53°
15
67°
54°
16
64°
53°
17
67°
54°
18
63°
54°
19
63°
53°
20
65°
54°
21
64°
53°
22
65°
49°
23
64°
50°
24
66°
53°
25
64°
51°
26
63°
51°
27
65°
54°
28
65°
53°
29
66°
53°
30
65°
50°
1
69°
50°
2
68°
51°
3
69°
55°
4
69°
55°
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 60° to 69°, with overnight lows between 47° and 55°. The average high for June is 65° 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.
