S
M
T
W
T
F
S
30
74°
60°
31
76°
63°
1
81°
64°
2
79°
63°
3
80°
59°
4
75°
58°
5
74°
57°
6
75°
59°
7
77°
58°
8
76°
60°
9
73°
58°
10
74°
55°
11
72°
42°
12
73°
55°
13
74°
57°
14
67°
54°
15
68°
55°
16
72°
55°
17
72°
52°
18
64°
51°
19
66°
54°
20
72°
55°
21
72°
55°
22
73°
54°
23
73°
53°
24
71°
52°
25
70°
51°
26
70°
52°
27
71°
53°
28
71°
51°
29
68°
49°
30
63°
48°
1
61°
49°
2
67°
51°
3
68°
49°
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 61° to 81°, with overnight lows between 42° and 64°. The average high for September is 72° 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.
