S
M
T
W
T
F
S
30
88°
65°
31
86°
59°
1
84°
58°
2
80°
59°
3
81°
59°
4
82°
60°
5
81°
59°
6
79°
58°
7
79°
58°
8
80°
60°
9
79°
58°
10
78°
58°
11
79°
60°
12
82°
58°
13
81°
57°
14
78°
56°
15
79°
57°
16
79°
54°
17
78°
55°
18
77°
55°
19
77°
60°
20
78°
59°
21
81°
58°
22
Hist. Avg.
77°
60°
23
Hist. Avg.
76°
60°
24
Hist. Avg.
76°
59°
25
Hist. Avg.
76°
59°
26
Hist. Avg.
75°
58°
27
Hist. Avg.
75°
58°
28
Hist. Avg.
75°
58°
29
Hist. Avg.
74°
57°
30
Hist. Avg.
74°
57°
1
Hist. Avg.
74°
56°
2
Hist. Avg.
73°
56°
3
Hist. Avg.
73°
56°
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 77° to 88°, with overnight lows between 54° and 65°. The average high for September is 80° with an average low of 58°. 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.
