S
M
T
W
T
F
S
30
82°
61°
31
73°
63°
1
71°
60°
2
74°
58°
3
78°
64°
4
79°
62°
5
72°
59°
6
67°
53°
7
76°
56°
8
78°
58°
9
76°
58°
10
83°
69°
11
74°
55°
12
72°
49°
13
71°
66°
14
72°
56°
15
70°
54°
16
71°
60°
17
76°
64°
18
74°
63°
19
72°
58°
20
67°
59°
21
69°
57°
22
65°
57°
23
66°
56°
24
66°
56°
25
69°
57°
26
68°
53°
27
64°
56°
28
70°
57°
29
70°
56°
30
63°
56°
1
62°
55°
2
62°
55°
3
68°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Barnstable
Barnstable's September 2026 forecast shows daily high temperatures ranging from 62° to 76°, with overnight lows between 53° and 66°. The average high for September is 68° 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 Barnstable. See also: October | November | December.
