S
M
T
W
T
F
S
28
94°
77°
29
94°
76°
30
96°
75°
1
96°
75°
2
93°
75°
3
96°
77°
4
95°
76°
5
93°
76°
6
91°
74°
7
92°
74°
8
91°
73°
9
91°
74°
10
92°
73°
11
90°
74°
12
90°
73°
13
92°
75°
14
92°
74°
15
91°
72°
16
91°
72°
17
92°
72°
18
90°
69°
19
93°
74°
20
94°
76°
21
94°
76°
22
95°
75°
23
95°
76°
24
94°
77°
25
95°
77°
26
96°
76°
27
96°
77°
28
95°
77°
29
95°
76°
30
96°
77°
31
95°
75°
1
92°
74°
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 90° to 96°, with overnight lows between 69° and 77°. The average high for July is 93° with an average low of 75°. 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.
