S
M
T
W
T
F
S
26
82°
63°
27
87°
67°
28
75°
67°
29
80°
65°
30
82°
64°
31
84°
63°
1
86°
65°
2
84°
66°
3
83°
65°
4
83°
66°
5
87°
66°
6
86°
67°
7
84°
66°
8
84°
64°
9
84°
66°
10
82°
67°
11
84°
67°
12
80°
66°
13
80°
67°
14
83°
66°
15
80°
62°
16
79°
65°
17
79°
65°
18
78°
64°
19
81°
66°
20
81°
65°
21
79°
64°
22
79°
64°
23
81°
66°
24
84°
60°
25
77°
58°
26
77°
65°
27
84°
66°
28
85°
66°
29
85°
65°
30
84°
64°
31
83°
57°
1
76°
57°
2
75°
56°
3
75°
56°
4
78°
62°
5
79°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Cornwall
Cornwall's August 2026 forecast shows daily high temperatures ranging from 75° to 87°, with overnight lows between 56° and 67°. The average high for August is 81° 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 August weather will actually feel in Cornwall. See also: September | October | November.
