S
M
T
W
T
F
S
28
82°
58°
29
89°
66°
30
92°
76°
1
97°
75°
2
95°
73°
3
91°
71°
4
84°
65°
5
81°
63°
6
80°
62°
7
86°
60°
8
85°
61°
9
85°
63°
10
86°
62°
11
86°
62°
12
87°
61°
13
84°
62°
14
85°
59°
15
77°
57°
16
78°
60°
17
76°
56°
18
79°
61°
19
81°
63°
20
84°
63°
21
84°
62°
22
82°
64°
23
83°
63°
24
81°
63°
25
83°
62°
26
84°
64°
27
85°
64°
28
84°
65°
29
85°
63°
30
84°
64°
31
84°
63°
1
80°
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 97°, with overnight lows between 56° 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.
