S
M
T
W
T
F
S
30
90°
68°
31
91°
67°
1
93°
67°
2
100°
73°
3
96°
72°
4
96°
72°
5
97°
73°
6
94°
69°
7
88°
68°
8
87°
67°
9
89°
66°
10
90°
68°
11
91°
66°
12
88°
65°
13
86°
65°
14
87°
66°
15
85°
60°
16
78°
65°
17
79°
63°
18
75°
64°
19
76°
64°
20
77°
63°
21
78°
64°
22
81°
63°
23
80°
62°
24
80°
63°
25
78°
63°
26
80°
61°
27
78°
54°
28
72°
52°
29
71°
51°
30
73°
51°
1
72°
53°
2
73°
57°
3
72°
58°
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 100°, with overnight lows between 51° and 73°. The average high for September is 83° with an average low of 63°. 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.
