S
M
T
W
T
F
S
28
82°
70°
29
91°
70°
30
93°
72°
1
95°
68°
2
97°
68°
3
97°
70°
4
90°
70°
5
86°
68°
6
86°
70°
7
86°
70°
8
88°
68°
9
81°
66°
10
77°
68°
11
75°
64°
12
78°
64°
13
80°
63°
14
84°
64°
15
86°
66°
16
85°
65°
17
87°
64°
18
83°
66°
19
84°
63°
20
82°
64°
21
83°
64°
22
82°
63°
23
86°
62°
24
88°
67°
25
88°
66°
26
86°
65°
27
87°
65°
28
87°
66°
29
86°
66°
30
81°
66°
31
81°
64°
1
80°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in St. Charles
St. Charles's July 2026 forecast shows daily high temperatures ranging from 75° to 88°, with overnight lows between 62° and 68°. The average high for July is 83° 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 St. Charles. See also: August | September | October.
