S
M
T
W
T
F
S
30
96°
75°
31
97°
74°
1
99°
68°
2
99°
71°
3
97°
72°
4
97°
73°
5
100°
70°
6
96°
73°
7
87°
71°
8
99°
70°
9
78°
65°
10
83°
59°
11
83°
64°
12
84°
66°
13
86°
70°
14
92°
62°
15
77°
58°
16
76°
62°
17
82°
58°
18
77°
56°
19
71°
52°
20
74°
50°
21
71°
53°
22
77°
52°
23
82°
58°
24
81°
60°
25
83°
59°
26
82°
58°
27
82°
59°
28
81°
59°
29
78°
57°
30
79°
54°
1
74°
50°
2
78°
56°
3
79°
57°
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 92°, with overnight lows between 50° and 70°. The average high for September is 80° 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.
