S
M
T
W
T
F
S
30
84°
56°
31
78°
67°
1
89°
70°
2
79°
70°
3
88°
72°
4
87°
62°
5
79°
58°
6
76°
56°
7
78°
59°
8
77°
60°
9
80°
60°
10
80°
61°
11
78°
60°
12
80°
57°
13
79°
58°
14
77°
57°
15
75°
59°
16
74°
60°
17
75°
53°
18
72°
52°
19
72°
51°
20
73°
54°
21
76°
59°
22
79°
59°
23
80°
58°
24
80°
57°
25
78°
54°
26
77°
56°
27
78°
57°
28
77°
57°
29
78°
55°
30
72°
51°
1
68°
48°
2
71°
52°
3
75°
55°
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 68° to 89°, with overnight lows between 48° and 72°. The average high for September is 77° with an average low of 58°. 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.
