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°
36°
11
79°
40°
12
82°
37°
13
81°
38°
14
76°
42°
15
82°
40°
16
86°
40°
17
87°
37°
18
86°
45°
19
85°
43°
20
81°
30°
21
82°
34°
22
85°
39°
23
87°
30°
24
76°
45°
25
84°
41°
26
83°
38°
27
75°
45°
28
71°
41°
29
73°
38°
30
72°
38°
1
75°
38°
2
81°
43°
3
81°
44°
4
83°
43°
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 71° to 83°, with overnight lows between 38° and 45°. The average high for June is 76° with an average low of 41°. 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.
