S
M
T
W
T
F
S
28
91°
73°
29
93°
73°
30
94°
74°
1
91°
74°
2
93°
72°
3
93°
75°
4
89°
73°
5
86°
69°
6
85°
69°
7
86°
71°
8
87°
70°
9
88°
72°
10
84°
71°
11
84°
67°
12
86°
66°
13
86°
70°
14
90°
70°
15
93°
72°
16
91°
71°
17
90°
71°
18
91°
68°
19
90°
71°
20
90°
69°
21
86°
68°
22
85°
66°
23
86°
69°
24
92°
73°
25
92°
74°
26
91°
74°
27
92°
73°
28
91°
73°
29
90°
72°
30
87°
71°
31
85°
70°
1
83°
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 93°, with overnight lows between 66° and 74°. The average high for July is 88° with an average low of 70°. 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.
