S
M
T
W
T
F
S
31
71°
39°
1
61°
39°
2
71°
48°
3
77°
52°
4
81°
54°
5
84°
60°
6
81°
59°
7
76°
56°
8
70°
54°
9
74°
57°
10
72°
55°
11
74°
58°
12
79°
55°
13
76°
57°
14
77°
53°
15
69°
49°
16
67°
50°
17
67°
49°
18
69°
50°
19
70°
52°
20
70°
51°
21
71°
51°
22
70°
52°
23
70°
54°
24
71°
57°
25
71°
53°
26
70°
52°
27
71°
59°
28
75°
58°
29
72°
56°
30
73°
54°
1
71°
54°
2
71°
55°
3
73°
60°
4
76°
60°
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 61° to 84°, with overnight lows between 39° and 60°. The average high for June is 73° with an average low of 54°. 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.
