S
M
T
W
T
F
S
30
81°
50°
31
81°
49°
1
80°
48°
2
79°
45°
3
78°
45°
4
75°
47°
5
72°
39°
6
71°
46°
7
71°
47°
8
77°
47°
9
79°
48°
10
69°
42°
11
68°
43°
12
70°
43°
13
73°
48°
14
77°
47°
15
78°
42°
16
69°
38°
17
68°
43°
18
72°
41°
19
68°
39°
20
75°
48°
21
Hist. Avg.
70°
41°
22
Hist. Avg.
70°
41°
23
Hist. Avg.
70°
41°
24
Hist. Avg.
69°
41°
25
Hist. Avg.
69°
40°
26
Hist. Avg.
69°
40°
27
Hist. Avg.
68°
40°
28
Hist. Avg.
68°
40°
29
Hist. Avg.
67°
40°
30
Hist. Avg.
67°
40°
1
Hist. Avg.
66°
39°
2
Hist. Avg.
66°
39°
3
Hist. Avg.
66°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Arlington
Arlington's September 2026 forecast shows daily high temperatures ranging from 68° to 81°, with overnight lows between 38° and 50°. The average high for September is 74° with an average low of 45°. 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.
