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°
44°
9
89°
45°
10
89°
50°
11
93°
58°
12
92°
56°
13
88°
53°
14
85°
54°
15
84°
55°
16
83°
54°
17
81°
53°
18
80°
52°
19
77°
54°
20
80°
53°
21
80°
54°
22
86°
51°
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 77° to 93°, with overnight lows between 45° 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.
