S
M
T
W
T
F
S
28
80°
67°
29
83°
69°
30
87°
67°
1
96°
69°
2
96°
68°
3
99°
69°
4
94°
68°
5
91°
66°
6
89°
67°
7
83°
69°
8
87°
70°
9
89°
70°
10
83°
69°
11
85°
67°
12
79°
67°
13
81°
65°
14
88°
62°
15
89°
64°
16
92°
66°
17
91°
69°
18
90°
71°
19
89°
74°
20
83°
65°
21
87°
69°
22
87°
69°
23
76°
62°
24
74°
60°
25
77°
62°
26
86°
65°
27
89°
71°
28
89°
70°
29
90°
64°
30
87°
61°
31
84°
63°
1
82°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Cornwall
Cornwall's July 2026 forecast shows daily high temperatures ranging from 82° to 90°, with overnight lows between 61° and 71°. The average high for July 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 July weather will actually feel in Cornwall. See also: August | September | October.
