S
M
T
W
T
F
S
28
84°
63°
29
83°
64°
30
84°
65°
1
83°
69°
2
89°
71°
3
90°
69°
4
88°
63°
5
84°
63°
6
83°
64°
7
84°
67°
8
84°
70°
9
85°
68°
10
85°
67°
11
86°
69°
12
85°
69°
13
85°
68°
14
86°
71°
15
88°
70°
16
89°
71°
17
90°
70°
18
91°
72°
19
91°
72°
20
92°
71°
21
92°
72°
22
91°
72°
23
91°
71°
24
92°
65°
25
91°
64°
26
84°
64°
27
82°
65°
28
83°
65°
29
83°
67°
30
84°
68°
31
84°
67°
1
85°
65°
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 92°, with overnight lows between 63° 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.
