S
M
T
W
T
F
S
28
83°
48°
29
83°
49°
30
82°
50°
1
83°
49°
2
83°
50°
3
82°
50°
4
84°
49°
5
85°
51°
6
83°
49°
7
78°
49°
8
81°
50°
9
82°
48°
10
77°
45°
11
82°
49°
12
86°
50°
13
87°
51°
14
86°
52°
15
87°
52°
16
86°
51°
17
86°
51°
18
87°
52°
19
87°
52°
20
86°
51°
21
84°
52°
22
80°
52°
23
80°
51°
24
85°
52°
25
86°
51°
26
86°
52°
27
88°
51°
28
88°
49°
29
89°
48°
30
87°
49°
31
90°
51°
1
89°
50°
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 77° to 90°, with overnight lows between 45° and 52°. The average high for July is 85° with an average low of 50°. 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.
