S
M
T
W
T
F
S
28
89°
72°
29
91°
70°
30
91°
69°
1
91°
69°
2
90°
68°
3
90°
70°
4
88°
65°
5
85°
69°
6
83°
62°
7
83°
63°
8
84°
64°
9
83°
64°
10
84°
69°
11
86°
69°
12
89°
68°
13
87°
69°
14
87°
69°
15
85°
68°
16
87°
68°
17
85°
69°
18
85°
68°
19
86°
67°
20
90°
69°
21
85°
66°
22
84°
67°
23
84°
67°
24
85°
68°
25
88°
69°
26
87°
69°
27
89°
68°
28
84°
69°
29
85°
69°
30
88°
70°
31
88°
70°
1
89°
69°
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 83° to 91°, with overnight lows between 62° and 72°. The average high for July is 87° with an average low of 68°. 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.
