S
M
T
W
T
F
S
28
73°
43°
29
73°
33°
30
74°
30°
1
75°
36°
2
78°
32°
3
80°
37°
4
84°
36°
5
85°
41°
6
87°
50°
7
88°
48°
8
88°
47°
9
89°
46°
10
90°
49°
11
93°
58°
12
92°
53°
13
85°
55°
14
85°
54°
15
82°
55°
16
83°
54°
17
81°
54°
18
80°
52°
19
81°
54°
20
83°
53°
21
86°
51°
22
86°
53°
23
87°
55°
24
78°
49°
25
79°
52°
26
80°
54°
27
80°
53°
28
81°
53°
29
84°
55°
30
86°
55°
31
86°
54°
1
85°
55°
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 78° to 93°, with overnight lows between 46° and 58°. The average high for July is 84° with an average low of 53°. 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.
