S
M
T
W
T
F
S
28
87°
65°
29
86°
64°
30
82°
65°
1
83°
71°
2
88°
71°
3
88°
70°
4
89°
71°
5
89°
67°
6
86°
65°
7
84°
65°
8
85°
66°
9
88°
70°
10
91°
72°
11
92°
72°
12
92°
71°
13
91°
65°
14
84°
64°
15
84°
65°
16
85°
66°
17
87°
65°
18
88°
66°
19
90°
71°
20
91°
68°
21
90°
66°
22
88°
71°
23
91°
72°
24
92°
69°
25
88°
69°
26
85°
68°
27
85°
69°
28
88°
70°
29
91°
68°
30
90°
69°
31
90°
71°
1
88°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Alton
Alton's July 2026 forecast shows daily high temperatures ranging from 82° to 92°, with overnight lows between 64° and 72°. The average high for July is 88° with an average low of 68°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Alton. See also: August | September | October.
