S
M
T
W
T
F
S
26
68°
60°
27
66°
58°
28
68°
60°
29
65°
59°
30
65°
61°
31
69°
61°
1
68°
58°
2
67°
57°
3
69°
60°
4
70°
58°
5
70°
60°
6
69°
58°
7
69°
60°
8
67°
61°
9
69°
59°
10
66°
60°
11
68°
59°
12
67°
59°
13
68°
58°
14
68°
57°
15
69°
59°
16
Hist. Avg.
65°
55°
17
Hist. Avg.
65°
55°
18
Hist. Avg.
65°
55°
19
Hist. Avg.
65°
55°
20
Hist. Avg.
65°
55°
21
Hist. Avg.
64°
55°
22
Hist. Avg.
64°
54°
23
Hist. Avg.
64°
54°
24
Hist. Avg.
64°
54°
25
Hist. Avg.
64°
54°
26
Hist. Avg.
64°
54°
27
Hist. Avg.
64°
54°
28
Hist. Avg.
64°
54°
29
Hist. Avg.
64°
54°
30
Hist. Avg.
64°
54°
31
Hist. Avg.
64°
54°
1
Hist. Avg.
63°
54°
2
Hist. Avg.
63°
53°
3
Hist. Avg.
63°
53°
4
Hist. Avg.
63°
53°
5
Hist. Avg.
63°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Port Isaac
Port Isaac's August 2026 forecast shows daily high temperatures ranging from 65° to 70°, with overnight lows between 57° and 61°. The average high for August is 68° with an average low of 59°. 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 Port Isaac. See also: September | October | November.
