S
M
T
W
T
F
S
30
96°
75°
31
97°
74°
1
99°
68°
2
99°
71°
3
97°
72°
4
97°
73°
5
100°
70°
6
96°
73°
7
87°
71°
8
99°
70°
9
82°
65°
10
84°
60°
11
85°
67°
12
81°
66°
13
84°
70°
14
92°
62°
15
77°
55°
16
76°
56°
17
78°
52°
18
73°
54°
19
76°
52°
20
74°
54°
21
78°
53°
22
82°
59°
23
82°
58°
24
81°
60°
25
82°
60°
26
81°
59°
27
81°
58°
28
80°
59°
29
78°
58°
30
76°
55°
1
74°
48°
2
66°
45°
3
65°
43°
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 65° to 92°, with overnight lows between 43° and 70°. The average high for September is 79° with an average low of 57°. 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.
