S
M
T
W
T
F
S
30
93°
65°
31
91°
66°
1
94°
66°
2
96°
65°
3
94°
63°
4
100°
65°
5
98°
68°
6
88°
67°
7
99°
69°
8
81°
69°
9
84°
57°
10
88°
64°
11
95°
62°
12
78°
64°
13
89°
62°
14
83°
54°
15
73°
58°
16
82°
60°
17
81°
53°
18
71°
49°
19
73°
51°
20
77°
51°
21
79°
52°
22
79°
49°
23
83°
57°
24
82°
56°
25
82°
56°
26
79°
55°
27
82°
56°
28
82°
54°
29
79°
52°
30
80°
52°
1
71°
51°
2
80°
51°
3
79°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Trenton
Trenton's September 2026 forecast shows daily high temperatures ranging from 71° to 95°, with overnight lows between 49° and 64°. The average high for September is 80° 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 Trenton. See also: October | November | December.
