S
M
T
W
T
F
S
30
67°
50°
31
65°
49°
1
64°
49°
2
64°
50°
3
65°
52°
4
66°
52°
5
66°
53°
6
67°
51°
7
64°
49°
8
62°
50°
9
64°
49°
10
63°
53°
11
65°
51°
12
66°
51°
13
66°
48°
14
65°
50°
15
66°
49°
16
65°
47°
17
65°
49°
18
64°
52°
19
67°
53°
20
66°
52°
21
67°
52°
22
67°
51°
23
65°
50°
24
66°
46°
25
61°
48°
26
64°
44°
27
66°
44°
28
58°
43°
29
56°
43°
30
64°
49°
1
61°
42°
2
57°
42°
3
Hist. Avg.
59°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Yarmouth
Yarmouth's September 2026 forecast shows daily high temperatures ranging from 56° to 67°, with overnight lows between 42° and 53°. The average high for September is 64° with an average low of 49°. 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 Yarmouth. See also: October | November | December.
