S
M
T
W
T
F
S
28
81°
60°
29
91°
75°
30
92°
76°
1
92°
77°
2
93°
70°
3
87°
70°
4
84°
68°
5
77°
65°
6
81°
64°
7
85°
60°
8
87°
64°
9
85°
70°
10
82°
65°
11
84°
63°
12
87°
62°
13
92°
69°
14
96°
70°
15
96°
71°
16
96°
73°
17
92°
71°
18
89°
70°
19
89°
69°
20
86°
64°
21
83°
62°
22
82°
63°
23
83°
65°
24
85°
64°
25
86°
63°
26
84°
62°
27
84°
67°
28
85°
63°
29
79°
61°
30
78°
60°
31
81°
65°
1
84°
67°
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 78° to 96°, with overnight lows between 60° and 73°. The average high for July is 87° with an average low of 66°. 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.
