S
M
T
W
T
F
S
28
82°
58°
29
90°
75°
30
96°
75°
1
99°
73°
2
95°
73°
3
90°
69°
4
87°
64°
5
84°
64°
6
85°
62°
7
80°
60°
8
83°
61°
9
85°
63°
10
83°
62°
11
84°
60°
12
81°
61°
13
77°
55°
14
76°
55°
15
77°
57°
16
78°
60°
17
78°
62°
18
82°
62°
19
78°
61°
20
79°
63°
21
83°
63°
22
83°
62°
23
85°
64°
24
84°
63°
25
85°
64°
26
86°
65°
27
85°
65°
28
84°
64°
29
85°
62°
30
81°
58°
31
77°
56°
1
77°
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 76° to 99°, with overnight lows between 55° and 75°. The average high for July is 84° with an average low of 63°. 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.
