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°
49°
6
85°
47°
7
86°
50°
8
87°
45°
9
87°
45°
10
91°
51°
11
93°
54°
12
92°
53°
13
91°
52°
14
88°
54°
15
86°
54°
16
83°
55°
17
84°
54°
18
84°
50°
19
82°
54°
20
83°
54°
21
86°
54°
22
86°
53°
23
87°
55°
24
87°
55°
25
86°
54°
26
86°
55°
27
85°
55°
28
86°
54°
29
86°
55°
30
87°
56°
31
87°
55°
1
85°
54°
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 82° to 93°, with overnight lows between 45° and 56°. The average high for July is 86° 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.
