S
M
T
W
T
F
S
26
83°
69°
27
83°
69°
28
82°
68°
29
83°
69°
30
80°
68°
31
77°
67°
1
76°
66°
2
76°
65°
3
77°
67°
4
77°
66°
5
76°
66°
6
76°
67°
7
77°
68°
8
78°
67°
9
77°
66°
10
81°
62°
11
79°
62°
12
81°
65°
13
78°
66°
14
81°
67°
15
83°
66°
16
83°
66°
17
82°
67°
18
83°
66°
19
82°
63°
20
80°
60°
21
76°
59°
22
75°
59°
23
75°
57°
24
76°
59°
25
77°
59°
26
80°
58°
27
80°
59°
28
78°
63°
29
76°
62°
30
77°
61°
31
79°
63°
1
79°
56°
2
80°
55°
3
72°
56°
4
73°
57°
5
75°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in South Dennis
South Dennis's August 2026 forecast shows daily high temperatures ranging from 72° to 83°, with overnight lows between 55° and 69°. The average high for August is 79° with an average low of 63°. 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 South Dennis. See also: September | October | November.
