S
M
T
W
T
F
S
30
84°
54°
31
72°
63°
1
73°
59°
2
75°
59°
3
80°
60°
4
81°
62°
5
72°
57°
6
69°
55°
7
79°
51°
8
81°
53°
9
79°
57°
10
86°
65°
11
77°
51°
12
75°
61°
13
70°
63°
14
75°
53°
15
71°
52°
16
76°
62°
17
82°
64°
18
77°
58°
19
74°
57°
20
69°
56°
21
71°
56°
22
73°
55°
23
72°
58°
24
74°
54°
25
67°
50°
26
67°
53°
27
68°
56°
28
71°
55°
29
66°
53°
30
66°
54°
1
67°
56°
2
71°
55°
3
70°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Plymouth
Plymouth's September 2026 forecast shows daily high temperatures ranging from 66° to 82°, with overnight lows between 50° and 64°. The average high for September is 72° 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 Plymouth. See also: October | November | December.
