S
M
T
W
T
F
S
31
76°
43°
1
73°
51°
2
77°
47°
3
83°
50°
4
85°
54°
5
82°
63°
6
84°
58°
7
79°
55°
8
85°
66°
9
81°
65°
10
85°
66°
11
88°
65°
12
89°
62°
13
83°
57°
14
79°
56°
15
76°
55°
16
75°
55°
17
75°
56°
18
74°
56°
19
76°
55°
20
76°
60°
21
80°
59°
22
74°
60°
23
74°
60°
24
79°
61°
25
79°
61°
26
75°
62°
27
82°
60°
28
75°
59°
29
75°
59°
30
78°
62°
1
80°
59°
2
76°
56°
3
76°
61°
4
77°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in St. Charles
St. Charles's June 2026 forecast shows daily high temperatures ranging from 74° to 89°, with overnight lows between 55° and 66°. The average high for June is 79° with an average low of 59°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how June weather will actually feel in St. Charles. See also: July | August | September.
