S
M
T
W
T
F
S
30
79°
65°
31
86°
70°
1
89°
73°
2
93°
73°
3
94°
71°
4
85°
69°
5
82°
67°
6
79°
59°
7
80°
60°
8
84°
70°
9
87°
68°
10
76°
55°
11
79°
60°
12
82°
62°
13
83°
64°
14
79°
61°
15
77°
56°
16
74°
54°
17
78°
55°
18
77°
54°
19
74°
54°
20
72°
52°
21
78°
57°
22
69°
56°
23
71°
56°
24
77°
55°
25
78°
57°
26
78°
56°
27
76°
56°
28
78°
57°
29
78°
57°
30
77°
56°
1
78°
54°
2
73°
48°
3
63°
44°
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 63° to 87°, with overnight lows between 44° and 70°. The average high for September is 77° with an average low of 57°. 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.
