S
M
T
W
T
F
S
30
100°
73°
31
96°
77°
1
86°
76°
2
91°
76°
3
91°
76°
4
96°
74°
5
91°
72°
6
95°
74°
7
95°
77°
8
94°
73°
9
93°
73°
10
91°
72°
11
90°
73°
12
90°
71°
13
90°
72°
14
90°
71°
15
89°
70°
16
90°
68°
17
88°
68°
18
89°
67°
19
87°
65°
20
84°
65°
21
87°
64°
22
88°
67°
23
89°
68°
24
88°
68°
25
88°
67°
26
87°
67°
27
87°
66°
28
86°
66°
29
85°
67°
30
86°
66°
1
82°
58°
2
78°
58°
3
78°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in DeQuincy
DeQuincy's September 2026 forecast shows daily high temperatures ranging from 78° to 94°, with overnight lows between 57° and 73°. The average high for September is 87° with an average low of 67°. 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 DeQuincy. See also: October | November | December.
