S
M
T
W
T
F
S
31
74°
61°
1
75°
56°
2
76°
58°
3
77°
61°
4
78°
65°
5
80°
66°
6
78°
66°
7
80°
67°
8
82°
67°
9
82°
66°
10
85°
68°
11
85°
68°
12
84°
67°
13
86°
69°
14
86°
69°
15
87°
68°
16
87°
69°
17
88°
69°
18
89°
68°
19
88°
69°
20
86°
70°
21
83°
70°
22
84°
71°
23
89°
71°
24
88°
72°
25
91°
71°
26
91°
70°
27
88°
65°
28
83°
65°
29
85°
63°
30
84°
66°
1
86°
69°
2
88°
67°
3
88°
64°
4
84°
65°
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 74° to 91°, with overnight lows between 56° and 72°. The average high for June is 84° with an average low of 67°. 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.
