S
M
T
W
T
F
S
31
72°
30°
1
76°
32°
2
79°
32°
3
79°
36°
4
82°
37°
5
85°
33°
6
80°
30°
7
76°
36°
8
76°
28°
9
77°
46°
10
82°
48°
11
84°
46°
12
85°
50°
13
80°
49°
14
83°
51°
15
83°
46°
16
86°
48°
17
89°
49°
18
82°
46°
19
80°
42°
20
84°
45°
21
84°
44°
22
85°
45°
23
81°
44°
24
78°
48°
25
80°
49°
26
81°
49°
27
80°
50°
28
82°
50°
29
84°
49°
30
85°
51°
1
85°
52°
2
86°
52°
3
86°
51°
4
84°
52°
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 78° to 89°, with overnight lows between 42° and 52°. The average high for June is 83° with an average low of 48°. 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.
