S
M
T
W
T
F
S
30
90°
70°
31
90°
70°
1
89°
71°
2
90°
71°
3
84°
70°
4
84°
68°
5
85°
64°
6
83°
63°
7
82°
63°
8
87°
66°
9
89°
69°
10
88°
69°
11
89°
59°
12
82°
67°
13
85°
59°
14
83°
60°
15
82°
61°
16
86°
63°
17
87°
66°
18
88°
66°
19
88°
59°
20
83°
57°
21
79°
58°
22
79°
57°
23
78°
63°
24
79°
62°
25
80°
64°
26
77°
63°
27
83°
62°
28
77°
58°
29
81°
58°
30
83°
57°
1
81°
59°
2
82°
60°
3
77°
51°
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 77° to 90°, with overnight lows between 51° and 71°. The average high for September is 84° with an average low of 63°. 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.
