S
M
T
W
T
F
S
31
80°
66°
1
84°
66°
2
82°
60°
3
82°
53°
4
85°
57°
5
87°
69°
6
88°
73°
7
89°
73°
8
86°
70°
9
91°
74°
10
92°
76°
11
92°
68°
12
83°
64°
13
80°
63°
14
77°
60°
15
77°
56°
16
80°
57°
17
92°
56°
18
76°
60°
19
83°
66°
20
84°
69°
21
78°
62°
22
75°
57°
23
77°
61°
24
83°
65°
25
81°
65°
26
82°
69°
27
84°
68°
28
85°
70°
29
84°
66°
30
83°
69°
1
87°
68°
2
84°
71°
3
85°
71°
4
83°
70°
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 75° to 87°, with overnight lows between 57° and 71°. The average high for June is 82° with an average low of 66°. 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.
