S
M
T
W
T
F
S
30
76°
52°
31
75°
59°
1
72°
64°
2
70°
63°
3
78°
58°
4
77°
56°
5
73°
51°
6
69°
44°
7
76°
52°
8
75°
57°
9
76°
67°
10
77°
53°
11
73°
46°
12
77°
52°
13
79°
54°
14
75°
53°
15
73°
52°
16
75°
50°
17
72°
48°
18
71°
47°
19
70°
51°
20
69°
44°
21
67°
49°
22
65°
48°
23
67°
49°
24
69°
47°
25
71°
48°
26
72°
44°
27
65°
39°
28
68°
44°
29
72°
47°
30
73°
47°
1
72°
46°
2
70°
47°
3
68°
45°
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 65° to 79°, with overnight lows between 39° and 67°. The average high for September is 72° with an average low of 49°. 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.
