S
M
T
W
T
F
S
31
69°
43°
1
70°
44°
2
76°
47°
3
80°
51°
4
84°
57°
5
80°
58°
6
80°
56°
7
76°
57°
8
77°
56°
9
78°
59°
10
79°
58°
11
79°
57°
12
78°
57°
13
76°
53°
14
73°
49°
15
69°
49°
16
68°
50°
17
69°
51°
18
71°
53°
19
71°
55°
20
72°
52°
21
75°
55°
22
77°
59°
23
73°
58°
24
75°
58°
25
73°
55°
26
72°
53°
27
73°
60°
28
74°
59°
29
74°
54°
30
72°
53°
1
73°
54°
2
74°
60°
3
79°
61°
4
81°
59°
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 68° to 84°, with overnight lows between 44° and 61°. The average high for June is 75° with an average low of 55°. 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.
