S
M
T
W
T
F
S
31
69°
43°
1
70°
39°
2
77°
42°
3
83°
46°
4
80°
55°
5
81°
54°
6
78°
64°
7
70°
47°
8
79°
45°
9
84°
49°
10
79°
69°
11
84°
68°
12
88°
58°
13
79°
62°
14
79°
54°
15
70°
51°
16
70°
53°
17
70°
54°
18
71°
55°
19
75°
56°
20
73°
54°
21
73°
56°
22
74°
56°
23
73°
55°
24
73°
58°
25
74°
53°
26
71°
52°
27
72°
52°
28
73°
53°
29
73°
53°
30
77°
60°
1
80°
61°
2
75°
61°
3
77°
60°
4
77°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Cornwall
Cornwall's June 2026 forecast shows daily high temperatures ranging from 70° to 88°, with overnight lows between 51° and 69°. The average high for June is 75° with an average low of 57°. 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 Cornwall. See also: July | August | September.
