S
M
T
W
T
F
S
30
67°
61°
31
67°
59°
1
67°
57°
2
N/A
3
70°
64°
4
67°
53°
5
68°
58°
6
71°
60°
7
69°
56°
8
65°
52°
9
65°
52°
10
64°
56°
11
66°
54°
12
66°
53°
13
67°
55°
14
66°
56°
15
65°
55°
16
62°
52°
17
63°
54°
18
63°
54°
19
64°
55°
20
65°
56°
21
65°
56°
22
64°
55°
23
64°
55°
24
63°
54°
25
64°
55°
26
62°
54°
27
64°
54°
28
64°
53°
29
63°
54°
30
64°
54°
1
59°
53°
2
59°
53°
3
61°
50°
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 59° to 71°, with overnight lows between 50° and 64°. The average high for September is 65° 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 Plymouth. See also: October | November | December.
