S
M
T
W
T
F
S
28
85°
74°
29
87°
85°
30
91°
75°
1
93°
74°
2
90°
74°
3
91°
74°
4
90°
68°
5
86°
68°
6
87°
68°
7
86°
70°
8
87°
69°
9
86°
68°
10
88°
68°
11
88°
69°
12
91°
66°
13
88°
67°
14
85°
64°
15
83°
64°
16
87°
67°
17
84°
66°
18
89°
70°
19
90°
70°
20
89°
69°
21
89°
69°
22
90°
70°
23
91°
70°
24
89°
69°
25
87°
69°
26
89°
68°
27
88°
69°
28
90°
68°
29
87°
69°
30
88°
68°
31
86°
68°
1
83°
63°
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 83° to 93°, with overnight lows between 63° and 74°. The average high for July is 88° with an average low of 69°. 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.
