S
M
T
W
T
F
S
30
73°
51°
31
76°
50°
1
74°
52°
2
68°
60°
3
68°
58°
4
78°
61°
5
71°
58°
6
71°
48°
7
77°
46°
8
74°
48°
9
64°
46°
10
80°
59°
11
69°
46°
12
74°
37°
13
64°
54°
14
66°
53°
15
70°
37°
16
78°
48°
17
74°
57°
18
73°
53°
19
66°
38°
20
N/A
21
64°
41°
22
65°
38°
23
66°
38°
24
65°
40°
25
63°
46°
26
64°
44°
27
67°
41°
28
66°
44°
29
67°
43°
30
70°
45°
1
67°
44°
2
68°
37°
3
60°
42°
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 60° to 70°, with overnight lows between 37° and 46°. The average high for September is 66° with an average low of 42°. 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.
