S
M
T
W
T
F
S
26
76°
54°
27
75°
53°
28
75°
56°
29
76°
61°
30
80°
62°
31
83°
63°
1
84°
63°
2
83°
62°
3
85°
63°
4
85°
57°
5
77°
55°
6
75°
55°
7
75°
54°
8
76°
56°
9
78°
58°
10
78°
60°
11
79°
60°
12
81°
61°
13
82°
59°
14
81°
61°
15
82°
60°
16
83°
53°
17
76°
53°
18
76°
52°
19
78°
53°
20
81°
59°
21
81°
59°
22
73°
58°
23
75°
55°
24
77°
58°
25
80°
58°
26
81°
56°
27
80°
49°
28
75°
52°
29
74°
56°
30
72°
57°
31
80°
58°
1
81°
56°
2
77°
55°
3
78°
49°
4
72°
48°
5
80°
56°
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 72° to 85°, with overnight lows between 48° and 63°. The average high for August is 78° with an average low of 57°. 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.
