S
M
T
W
T
F
S
30
82°
63°
31
80°
68°
1
89°
67°
2
73°
67°
3
89°
71°
4
88°
69°
5
83°
63°
6
80°
55°
7
82°
55°
8
85°
60°
9
87°
70°
10
89°
67°
11
83°
55°
12
82°
65°
13
85°
68°
14
77°
49°
15
75°
54°
16
83°
59°
17
84°
70°
18
86°
64°
19
72°
63°
20
70°
60°
21
71°
57°
22
65°
51°
23
64°
51°
24
65°
50°
25
67°
51°
26
70°
52°
27
66°
49°
28
70°
49°
29
69°
50°
30
70°
50°
1
70°
49°
2
71°
48°
3
67°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Plainsboro Township
Plainsboro Township's September 2026 forecast shows daily high temperatures ranging from 64° to 71°, with overnight lows between 48° and 57°. The average high for September is 68° with an average low of 51°. 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 Plainsboro Township. See also: October | November | December.
