S
M
T
W
T
F
S
31
70°
38°
1
76°
42°
2
77°
38°
3
79°
44°
4
75°
38°
5
77°
44°
6
79°
45°
7
67°
39°
8
74°
46°
9
74°
46°
10
75°
45°
11
70°
41°
12
67°
42°
13
73°
45°
14
79°
46°
15
78°
45°
16
74°
41°
17
78°
47°
18
77°
46°
19
80°
48°
20
80°
44°
21
80°
48°
22
80°
48°
23
71°
47°
24
78°
46°
25
77°
46°
26
80°
48°
27
82°
48°
28
82°
47°
29
83°
49°
30
83°
49°
1
84°
50°
2
85°
51°
3
83°
50°
4
79°
49°
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 67° to 85°, with overnight lows between 38° and 51°. The average high for June is 78° with an average low of 46°. 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.
