S
M
T
W
T
F
S
30
72°
57°
31
73°
57°
1
71°
56°
2
70°
58°
3
71°
59°
4
70°
59°
5
71°
58°
6
72°
57°
7
70°
56°
8
71°
57°
9
69°
56°
10
70°
61°
11
70°
55°
12
72°
55°
13
73°
54°
14
71°
59°
15
71°
58°
16
70°
54°
17
67°
53°
18
68°
53°
19
68°
58°
20
68°
59°
21
72°
58°
22
70°
57°
23
72°
57°
24
71°
55°
25
69°
56°
26
65°
49°
27
70°
49°
28
63°
50°
29
62°
50°
30
67°
52°
1
65°
49°
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
September Weather in Barnstable
Barnstable's September 2026 forecast shows daily high temperatures ranging from 62° to 73°, with overnight lows between 49° and 61°. The average high for September is 70° with an average low of 55°. 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.
