S
M
T
W
T
F
S
30
80°
65°
31
82°
69°
1
85°
69°
2
85°
68°
3
86°
62°
4
83°
60°
5
78°
60°
6
78°
66°
7
79°
66°
8
82°
65°
9
83°
66°
10
78°
65°
11
82°
64°
12
82°
65°
13
81°
65°
14
80°
64°
15
83°
65°
16
83°
61°
17
80°
64°
18
79°
58°
19
79°
57°
20
74°
55°
21
72°
54°
22
71°
61°
23
72°
57°
24
76°
54°
25
70°
53°
26
70°
53°
27
72°
55°
28
76°
59°
29
75°
57°
30
76°
55°
1
69°
58°
2
68°
51°
3
72°
51°
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 68° to 86°, with overnight lows between 51° and 69°. The average high for September is 78° with an average low of 60°. 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.
