S
M
T
W
T
F
S
28
75°
58°
29
78°
52°
30
74°
53°
1
75°
56°
2
77°
60°
3
78°
60°
4
81°
59°
5
81°
61°
6
82°
57°
7
82°
56°
8
80°
57°
9
82°
59°
10
82°
55°
11
81°
61°
12
82°
57°
13
80°
53°
14
77°
55°
15
77°
55°
16
76°
54°
17
77°
62°
18
80°
57°
19
82°
55°
20
81°
54°
21
78°
53°
22
78°
54°
23
77°
53°
24
77°
58°
25
78°
62°
26
83°
62°
27
82°
61°
28
79°
61°
29
84°
60°
30
85°
62°
31
84°
63°
1
84°
62°
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 74° to 85°, with overnight lows between 52° and 63°. The average high for July is 80° 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.
