S
M
T
W
T
F
S
30
87°
67°
31
88°
70°
1
86°
69°
2
86°
63°
3
87°
62°
4
83°
62°
5
84°
63°
6
85°
67°
7
89°
70°
8
91°
70°
9
91°
69°
10
90°
68°
11
88°
69°
12
85°
69°
13
89°
62°
14
89°
60°
15
83°
60°
16
84°
61°
17
83°
60°
18
84°
61°
19
84°
60°
20
86°
63°
21
88°
65°
22
83°
65°
23
81°
64°
24
81°
65°
25
79°
64°
26
82°
64°
27
85°
62°
28
84°
63°
29
85°
63°
30
85°
62°
1
84°
62°
2
85°
55°
3
86°
54°
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 79° to 91°, with overnight lows between 54° and 70°. The average high for September is 85° 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.
