S
M
T
W
T
F
S
28
70°
55°
29
66°
54°
30
72°
57°
1
68°
57°
2
64°
52°
3
N/A
4
71°
59°
5
74°
58°
6
74°
58°
7
72°
58°
8
79°
61°
9
83°
61°
10
83°
62°
11
82°
59°
12
81°
59°
13
79°
58°
14
81°
59°
15
82°
60°
16
72°
56°
17
71°
57°
18
72°
57°
19
71°
56°
20
67°
56°
21
68°
55°
22
70°
54°
23
72°
58°
24
73°
57°
25
73°
58°
26
74°
58°
27
73°
57°
28
72°
56°
29
67°
52°
30
68°
57°
31
69°
57°
1
72°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
July Weather in Alton
Alton's July 2026 forecast shows daily high temperatures ranging from 67° to 83°, with overnight lows between 52° and 62°. The average high for July is 74° 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.
