S
M
T
W
T
F
S
30
88°
67°
31
87°
63°
1
83°
63°
2
81°
64°
3
83°
66°
4
86°
67°
5
87°
66°
6
86°
65°
7
87°
66°
8
86°
62°
9
86°
65°
10
81°
66°
11
86°
64°
12
85°
61°
13
81°
63°
14
80°
64°
15
82°
64°
16
84°
62°
17
83°
59°
18
79°
57°
19
79°
57°
20
80°
62°
21
79°
59°
22
82°
58°
23
81°
59°
24
82°
60°
25
83°
61°
26
82°
56°
27
82°
54°
28
79°
56°
29
80°
54°
30
77°
54°
1
Hist. Avg.
79°
60°
2
Hist. Avg.
79°
60°
3
Hist. Avg.
79°
59°
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 77° to 88°, with overnight lows between 54° and 67°. The average high for September is 83° with an average low of 61°. 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.
