S
M
T
W
T
F
S
30
101°
74°
31
101°
71°
1
102°
70°
2
101°
74°
3
99°
74°
4
100°
72°
5
102°
71°
6
104°
71°
7
102°
74°
8
103°
76°
9
104°
75°
10
79°
65°
11
90°
63°
12
92°
70°
13
87°
68°
14
96°
75°
15
98°
76°
16
97°
73°
17
97°
72°
18
96°
73°
19
94°
71°
20
87°
69°
21
79°
64°
22
81°
62°
23
82°
61°
24
82°
59°
25
81°
64°
26
76°
66°
27
83°
66°
28
84°
64°
29
82°
66°
30
85°
72°
1
75°
67°
2
75°
57°
3
76°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Dennis
Dennis's September 2026 forecast shows daily high temperatures ranging from 76° to 76°, with overnight lows between 56° and 56°. The average high for September 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 September weather will actually feel in Dennis. See also: October | November | December.
