S
M
T
W
T
F
S
30
73°
51°
31
77°
47°
1
71°
50°
2
71°
57°
3
69°
47°
4
69°
50°
5
72°
48°
6
74°
51°
7
72°
51°
8
72°
43°
9
75°
45°
10
74°
47°
11
71°
46°
12
72°
46°
13
71°
45°
14
72°
46°
15
70°
47°
16
72°
43°
17
66°
44°
18
66°
40°
19
66°
40°
20
67°
45°
21
66°
44°
22
65°
42°
23
64°
38°
24
63°
37°
25
63°
36°
26
65°
38°
27
72°
42°
28
72°
43°
29
71°
44°
30
71°
43°
1
70°
44°
2
71°
44°
3
70°
43°
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 75°, with overnight lows between 36° and 51°. The average high for September is 69° with an average low of 44°. 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.
