S
M
T
W
T
F
S
28
86°
68°
29
89°
68°
30
93°
72°
1
97°
70°
2
96°
70°
3
98°
70°
4
87°
69°
5
87°
68°
6
84°
65°
7
81°
67°
8
78°
65°
9
81°
65°
10
82°
66°
11
83°
67°
12
81°
65°
13
76°
59°
14
75°
58°
15
75°
58°
16
76°
60°
17
76°
60°
18
77°
61°
19
78°
65°
20
81°
65°
21
81°
66°
22
80°
66°
23
77°
65°
24
77°
66°
25
81°
65°
26
82°
66°
27
81°
66°
28
80°
65°
29
77°
63°
30
76°
59°
31
74°
58°
1
73°
58°
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 73° to 98°, with overnight lows between 58° and 72°. The average high for July is 81° with an average low of 65°. 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.
