S
M
T
W
T
F
S
31
87°
67°
1
86°
66°
2
82°
60°
3
79°
53°
4
82°
65°
5
84°
66°
6
84°
69°
7
81°
71°
8
81°
70°
9
83°
68°
10
88°
67°
11
87°
66°
12
88°
67°
13
86°
67°
14
86°
66°
15
85°
65°
16
87°
63°
17
86°
62°
18
88°
66°
19
88°
68°
20
91°
67°
21
89°
67°
22
86°
66°
23
89°
68°
24
90°
69°
25
91°
69°
26
91°
68°
27
90°
68°
28
87°
67°
29
85°
68°
30
84°
68°
1
85°
67°
2
84°
68°
3
84°
67°
4
85°
64°
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 81° to 91°, with overnight lows between 62° and 71°. The average high for June is 86° 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.
