S
M
T
W
T
F
S
31
89°
66°
1
88°
65°
2
89°
64°
3
85°
65°
4
83°
64°
5
83°
69°
6
88°
69°
7
88°
68°
8
91°
68°
9
90°
70°
10
90°
71°
11
91°
71°
12
91°
70°
13
90°
71°
14
85°
71°
15
86°
70°
16
88°
71°
17
90°
68°
18
88°
70°
19
92°
72°
20
91°
70°
21
92°
69°
22
91°
68°
23
89°
66°
24
88°
66°
25
87°
68°
26
91°
67°
27
91°
70°
28
92°
73°
29
93°
71°
30
90°
71°
1
88°
72°
2
88°
71°
3
87°
73°
4
88°
72°
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 83° to 93°, with overnight lows between 64° and 73°. The average high for June is 89° with an average low of 69°. 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.
