S
M
T
W
T
F
S
30
77°
64°
31
87°
71°
1
85°
73°
2
91°
73°
3
92°
69°
4
87°
69°
5
79°
58°
6
79°
56°
7
82°
60°
8
81°
66°
9
86°
69°
10
80°
57°
11
70°
56°
12
75°
57°
13
78°
58°
14
77°
59°
15
78°
57°
16
77°
52°
17
77°
57°
18
72°
57°
19
78°
58°
20
76°
58°
21
76°
57°
22
75°
56°
23
72°
53°
24
69°
55°
25
75°
56°
26
73°
52°
27
65°
48°
28
64°
46°
29
63°
46°
30
63°
44°
1
62°
43°
2
63°
51°
3
68°
50°
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 62° to 87°, with overnight lows between 43° and 69°. The average high for September is 74° 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.
