S
M
T
W
T
F
S
30
101°
81°
31
100°
83°
1
100°
82°
2
101°
81°
3
92°
79°
4
99°
78°
5
100°
81°
6
100°
79°
7
101°
82°
8
101°
84°
9
101°
83°
10
100°
79°
11
99°
79°
12
104°
80°
13
101°
79°
14
100°
78°
15
99°
80°
16
100°
78°
17
101°
76°
18
93°
73°
19
90°
71°
20
87°
67°
21
89°
69°
22
89°
68°
23
88°
69°
24
87°
66°
25
91°
71°
26
90°
72°
27
90°
71°
28
89°
71°
29
90°
70°
30
89°
70°
1
89°
69°
2
88°
69°
3
89°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Dallas
Dallas's September 2026 forecast shows daily high temperatures ranging from 87° to 104°, with overnight lows between 66° and 80°. The average high for September is 93° with an average low of 72°. 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 Dallas. See also: October | November | December.
