S
M
T
W
T
F
S
30
99°
69°
31
98°
66°
1
95°
65°
2
94°
64°
3
95°
67°
4
96°
65°
5
95°
63°
6
95°
62°
7
93°
63°
8
92°
66°
9
90°
64°
10
89°
59°
11
90°
58°
12
89°
64°
13
89°
65°
14
88°
62°
15
88°
57°
16
87°
57°
17
85°
58°
18
86°
57°
19
88°
58°
20
87°
57°
21
85°
59°
22
86°
60°
23
88°
63°
24
89°
63°
25
91°
61°
26
91°
63°
27
90°
64°
28
92°
63°
29
92°
63°
30
91°
64°
1
91°
63°
2
90°
62°
3
91°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Arlington
Arlington's September 2026 forecast shows daily high temperatures ranging from 85° to 99°, with overnight lows between 57° and 69°. The average high for September is 91° with an average low of 62°. 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 Arlington. See also: October | November | December.
