S
M
T
W
T
F
S
31
64°
54°
1
66°
54°
2
64°
55°
3
66°
54°
4
63°
54°
5
61°
50°
6
64°
50°
7
64°
52°
8
62°
45°
9
59°
46°
10
60°
46°
11
61°
53°
12
70°
53°
13
76°
58°
14
78°
58°
15
72°
54°
16
72°
55°
17
71°
54°
18
72°
54°
19
73°
55°
20
74°
56°
21
63°
51°
22
62°
49°
23
63°
54°
24
64°
53°
25
64°
52°
26
65°
49°
27
64°
49°
28
64°
50°
29
65°
55°
30
65°
54°
1
66°
51°
2
67°
53°
3
65°
50°
4
64°
51°
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 59° to 78°, with overnight lows between 45° and 58°. The average high for June is 67° 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.
