S
M
T
W
T
F
S
26
76°
53°
27
77°
54°
28
81°
55°
29
83°
61°
30
83°
59°
31
77°
58°
1
77°
56°
2
79°
59°
3
83°
61°
4
83°
55°
5
76°
53°
6
74°
53°
7
75°
59°
8
76°
58°
9
77°
55°
10
82°
61°
11
83°
62°
12
83°
60°
13
81°
55°
14
75°
54°
15
76°
52°
16
75°
53°
17
77°
54°
18
75°
59°
19
79°
58°
20
74°
52°
21
73°
51°
22
73°
51°
23
76°
54°
24
77°
57°
25
76°
55°
26
73°
50°
27
73°
48°
28
71°
50°
29
72°
52°
30
73°
49°
31
74°
52°
1
73°
52°
2
75°
50°
3
77°
51°
4
78°
55°
5
77°
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 71° to 83°, with overnight lows between 48° and 62°. The average high for August is 77° with an average low of 55°. 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.
