S
M
T
W
T
F
S
28
83°
66°
29
87°
70°
30
91°
67°
1
97°
69°
2
99°
70°
3
102°
73°
4
103°
72°
5
97°
68°
6
98°
71°
7
89°
71°
8
87°
70°
9
90°
69°
10
92°
70°
11
89°
69°
12
84°
64°
13
85°
63°
14
91°
64°
15
89°
67°
16
91°
67°
17
90°
70°
18
90°
68°
19
87°
67°
20
92°
68°
21
86°
65°
22
86°
65°
23
88°
66°
24
90°
69°
25
86°
68°
26
90°
70°
27
91°
70°
28
91°
69°
29
86°
70°
30
90°
70°
31
91°
69°
1
90°
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 84° to 98°, with overnight lows between 63° and 71°. The average high for July is 89° 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.
