S
M
T
W
T
F
S
26
81°
61°
27
79°
56°
28
80°
54°
29
75°
54°
30
75°
61°
31
76°
57°
1
77°
55°
2
79°
60°
3
79°
55°
4
78°
54°
5
74°
55°
6
73°
53°
7
72°
54°
8
72°
53°
9
74°
55°
10
75°
60°
11
78°
57°
12
78°
56°
13
77°
55°
14
75°
55°
15
74°
61°
16
79°
57°
17
79°
59°
18
78°
52°
19
74°
52°
20
73°
53°
21
75°
59°
22
75°
58°
23
76°
59°
24
79°
60°
25
78°
59°
26
78°
58°
27
77°
52°
28
75°
51°
29
71°
59°
30
76°
57°
31
77°
50°
1
Hist. Avg.
76°
55°
2
Hist. Avg.
75°
54°
3
Hist. Avg.
75°
54°
4
Hist. Avg.
75°
54°
5
Hist. Avg.
75°
53°
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 81°, with overnight lows between 50° and 61°. The average high for August is 76° with an average low of 56°. 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.
