S
M
T
W
T
F
S
30
82°
64°
31
89°
62°
1
91°
63°
2
90°
65°
3
91°
61°
4
91°
56°
5
83°
57°
6
83°
55°
7
84°
60°
8
87°
59°
9
86°
50°
10
79°
49°
11
77°
49°
12
76°
51°
13
78°
57°
14
77°
47°
15
78°
45°
16
76°
45°
17
75°
46°
18
74°
45°
19
73°
44°
20
72°
44°
21
74°
45°
22
75°
46°
23
80°
52°
24
81°
53°
25
82°
52°
26
82°
48°
27
74°
50°
28
74°
42°
29
78°
42°
30
71°
50°
1
72°
42°
2
73°
49°
3
72°
41°
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 91°, with overnight lows between 41° and 65°. The average high for September is 79° 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 Trenton. See also: October | November | December.
