S
M
T
W
T
F
S
28
78°
59°
29
78°
60°
30
79°
59°
1
79°
63°
2
86°
67°
3
85°
66°
4
80°
65°
5
83°
66°
6
86°
67°
7
87°
68°
8
87°
67°
9
86°
68°
10
87°
64°
11
81°
61°
12
79°
64°
13
79°
64°
14
80°
62°
15
80°
63°
16
81°
67°
17
81°
67°
18
82°
66°
19
85°
68°
20
84°
65°
21
81°
63°
22
82°
65°
23
81°
65°
24
88°
60°
25
86°
60°
26
81°
62°
27
80°
61°
28
81°
61°
29
82°
60°
30
81°
61°
31
81°
63°
1
80°
62°
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 78° to 88°, with overnight lows between 59° and 68°. The average high for July is 82° with an average low of 64°. 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.
