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°
68°
7
92°
71°
8
90°
70°
9
95°
70°
10
94°
67°
11
90°
71°
12
82°
70°
13
79°
65°
14
88°
60°
15
97°
67°
16
99°
71°
17
99°
71°
18
95°
72°
19
89°
67°
20
90°
68°
21
89°
65°
22
90°
65°
23
84°
66°
24
85°
65°
25
84°
68°
26
87°
67°
27
89°
70°
28
90°
70°
29
92°
68°
30
87°
69°
31
86°
70°
1
87°
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 79° to 99°, with overnight lows between 60° and 72°. 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.
