S
M
T
W
T
F
S
30
94°
66°
31
95°
70°
1
96°
73°
2
98°
74°
3
100°
76°
4
98°
75°
5
96°
72°
6
91°
70°
7
92°
67°
8
93°
68°
9
92°
68°
10
90°
67°
11
87°
65°
12
82°
63°
13
87°
64°
14
81°
59°
15
80°
64°
16
78°
64°
17
80°
63°
18
84°
63°
19
85°
64°
20
84°
63°
21
84°
62°
22
84°
62°
23
83°
61°
24
85°
62°
25
85°
62°
26
84°
60°
27
83°
61°
28
83°
61°
29
82°
60°
30
83°
60°
1
82°
59°
2
82°
59°
3
81°
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 78° to 100°, with overnight lows between 58° and 76°. The average high for September is 87° with an average low of 65°. 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.
