S
M
T
W
T
F
S
30
72°
55°
31
73°
57°
1
73°
48°
2
68°
59°
3
75°
64°
4
70°
55°
5
72°
50°
6
77°
52°
7
73°
57°
8
66°
54°
9
66°
51°
10
65°
59°
11
69°
53°
12
66°
63°
13
68°
59°
14
67°
61°
15
70°
53°
16
67°
55°
17
66°
54°
18
68°
56°
19
69°
57°
20
68°
56°
21
69°
54°
22
67°
53°
23
68°
53°
24
67°
52°
25
64°
51°
26
63°
52°
27
66°
53°
28
64°
47°
29
60°
45°
30
59°
46°
1
59°
51°
2
63°
51°
3
64°
50°
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 59° to 70°, with overnight lows between 45° and 63°. The average high for September is 66° with an average low of 53°. 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.
