S
M
T
W
T
F
S
28
85°
74°
29
87°
85°
30
91°
75°
1
91°
80°
2
91°
74°
3
87°
67°
4
85°
67°
5
86°
66°
6
86°
63°
7
89°
63°
8
90°
67°
9
87°
67°
10
83°
67°
11
85°
63°
12
87°
59°
13
88°
61°
14
90°
62°
15
91°
65°
16
92°
67°
17
92°
71°
18
92°
71°
19
88°
69°
20
96°
71°
21
81°
62°
22
76°
60°
23
79°
60°
24
72°
64°
25
89°
76°
26
97°
77°
27
91°
78°
28
89°
73°
29
87°
68°
30
84°
70°
31
81°
63°
1
79°
62°
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 79° to 84°, with overnight lows between 62° and 70°. The average high for July is 81° 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.
