S
M
T
W
T
F
S
31
77°
52°
1
81°
63°
2
75°
50°
3
81°
45°
4
86°
50°
5
90°
54°
6
90°
61°
7
91°
63°
8
90°
68°
9
86°
63°
10
86°
69°
11
95°
70°
12
98°
69°
13
92°
68°
14
93°
72°
15
86°
65°
16
77°
61°
17
77°
60°
18
81°
61°
19
86°
65°
20
88°
66°
21
87°
65°
22
85°
63°
23
86°
64°
24
83°
61°
25
86°
67°
26
89°
66°
27
88°
62°
28
82°
61°
29
83°
61°
30
84°
62°
1
89°
67°
2
90°
68°
3
89°
69°
4
90°
67°
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 77° to 98°, with overnight lows between 60° and 72°. The average high for June is 87° with an average low of 65°. 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.
