S
M
T
W
T
F
S
28
96°
76°
29
96°
75°
30
97°
75°
1
96°
75°
2
93°
73°
3
95°
73°
4
92°
72°
5
87°
73°
6
92°
70°
7
89°
69°
8
90°
69°
9
88°
68°
10
91°
73°
11
90°
72°
12
89°
71°
13
89°
71°
14
90°
70°
15
90°
72°
16
91°
72°
17
92°
73°
18
92°
74°
19
91°
74°
20
91°
73°
21
92°
74°
22
93°
73°
23
92°
74°
24
92°
73°
25
90°
74°
26
92°
74°
27
93°
73°
28
94°
74°
29
94°
74°
30
93°
73°
31
91°
73°
1
91°
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 87° to 97°, with overnight lows between 68° and 76°. The average high for July is 92° with an average low of 73°. 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.
