S
M
T
W
T
F
S
31
75°
44°
1
77°
49°
2
75°
47°
3
82°
48°
4
86°
49°
5
88°
54°
6
86°
61°
7
84°
62°
8
75°
57°
9
82°
59°
10
84°
70°
11
95°
72°
12
93°
64°
13
89°
63°
14
91°
66°
15
77°
60°
16
71°
60°
17
76°
59°
18
77°
58°
19
81°
62°
20
83°
62°
21
80°
63°
22
81°
61°
23
78°
62°
24
78°
59°
25
79°
63°
26
81°
60°
27
76°
59°
28
78°
59°
29
78°
60°
30
79°
59°
1
79°
63°
2
86°
67°
3
85°
66°
4
80°
65°
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 71° to 95°, with overnight lows between 58° and 72°. The average high for June is 81° with an average low of 62°. 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.
