S
M
T
W
T
F
S
30
76°
67°
31
85°
69°
1
90°
71°
2
96°
71°
3
87°
70°
4
73°
71°
5
80°
61°
6
79°
57°
7
78°
55°
8
81°
57°
9
77°
68°
10
81°
58°
11
77°
54°
12
82°
60°
13
79°
54°
14
70°
48°
15
81°
57°
16
73°
64°
17
69°
62°
18
74°
54°
19
64°
57°
20
62°
58°
21
N/A
22
65°
53°
23
64°
49°
24
67°
45°
25
70°
49°
26
70°
47°
27
69°
51°
28
69°
49°
29
68°
51°
30
67°
50°
1
66°
49°
2
68°
46°
3
62°
52°
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 62° to 70°, with overnight lows between 45° and 53°. The average high for September is 67° 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 Plymouth. See also: October | November | December.
