S
M
T
W
T
F
S
30
94°
66°
31
96°
69°
1
96°
72°
2
98°
74°
3
99°
75°
4
98°
74°
5
99°
73°
6
96°
71°
7
94°
69°
8
96°
68°
9
92°
66°
10
93°
65°
11
86°
60°
12
87°
64°
13
88°
64°
14
80°
64°
15
79°
64°
16
78°
63°
17
80°
62°
18
84°
63°
19
85°
63°
20
85°
62°
21
84°
62°
22
84°
61°
23
85°
61°
24
85°
60°
25
84°
61°
26
85°
60°
27
84°
59°
28
84°
60°
29
83°
59°
30
84°
59°
1
83°
58°
2
82°
59°
3
82°
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 99°, with overnight lows between 58° and 75°. The average high for September is 87° with an average low of 64°. 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.
