S
M
T
W
T
F
S
30
80°
64°
31
84°
64°
1
77°
65°
2
77°
68°
3
79°
69°
4
82°
67°
5
83°
64°
6
80°
65°
7
81°
63°
8
78°
62°
9
79°
65°
10
77°
67°
11
82°
62°
12
79°
62°
13
76°
63°
14
77°
65°
15
79°
66°
16
80°
64°
17
80°
60°
18
75°
59°
19
74°
60°
20
75°
64°
21
76°
60°
22
76°
63°
23
79°
64°
24
78°
63°
25
79°
64°
26
78°
56°
27
78°
57°
28
71°
56°
29
72°
55°
30
75°
57°
1
74°
58°
2
Hist. Avg.
77°
61°
3
Hist. Avg.
77°
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 71° to 84°, with overnight lows between 55° and 69°. The average high for September is 78° 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.
