S
M
T
W
T
F
S
30
77°
61°
31
79°
63°
1
79°
56°
2
80°
55°
3
72°
56°
4
73°
57°
5
75°
62°
6
77°
59°
7
79°
55°
8
72°
59°
9
72°
61°
10
75°
61°
11
77°
60°
12
76°
59°
13
71°
59°
14
70°
54°
15
73°
53°
16
70°
52°
17
70°
56°
18
71°
56°
19
74°
57°
20
70°
59°
21
74°
56°
22
73°
50°
23
71°
55°
24
67°
57°
25
73°
54°
26
66°
52°
27
73°
56°
28
72°
55°
29
Hist. Avg.
67°
52°
30
Hist. Avg.
66°
52°
1
Hist. Avg.
66°
51°
2
Hist. Avg.
66°
51°
3
Hist. Avg.
65°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in South Dennis
South Dennis's September 2026 forecast shows daily high temperatures ranging from 66° to 80°, with overnight lows between 50° and 63°. The average high for September is 73° 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 September weather will actually feel in South Dennis. See also: October | November | December.
