S
M
T
W
T
F
S
28
75°
55°
29
70°
52°
30
73°
57°
1
75°
57°
2
77°
57°
3
77°
52°
4
79°
59°
5
83°
58°
6
86°
57°
7
86°
62°
8
90°
62°
9
90°
65°
10
91°
66°
11
89°
63°
12
88°
62°
13
87°
60°
14
83°
62°
15
84°
61°
16
82°
62°
17
73°
56°
18
74°
57°
19
73°
56°
20
71°
54°
21
73°
56°
22
72°
53°
23
71°
53°
24
73°
56°
25
74°
56°
26
73°
55°
27
73°
53°
28
72°
57°
29
73°
57°
30
70°
55°
31
70°
53°
1
71°
52°
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 70° to 91°, with overnight lows between 52° and 66°. The average high for July is 78° with an average low of 58°. 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.
