S
M
T
W
T
F
S
30
80°
65°
31
89°
70°
1
90°
73°
2
93°
72°
3
93°
75°
4
89°
73°
5
88°
70°
6
78°
59°
7
79°
55°
8
N/A
9
81°
66°
10
80°
51°
11
80°
59°
12
83°
62°
13
81°
68°
14
86°
70°
15
76°
58°
16
74°
55°
17
75°
54°
18
70°
50°
19
68°
49°
20
70°
49°
21
69°
51°
22
69°
51°
23
71°
56°
24
77°
55°
25
72°
56°
26
77°
56°
27
77°
55°
28
76°
56°
29
76°
56°
30
75°
54°
1
74°
51°
2
69°
54°
3
73°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Plymouth
Plymouth's September 2026 forecast shows daily high temperatures ranging from 68° to 86°, with overnight lows between 49° and 70°. The average high for September is 75° 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.
