S
M
T
W
T
F
S
30
88°
61°
31
91°
67°
1
93°
71°
2
94°
69°
3
94°
71°
4
94°
69°
5
88°
62°
6
81°
58°
7
83°
62°
8
86°
67°
9
89°
70°
10
83°
60°
11
82°
59°
12
84°
62°
13
80°
59°
14
82°
61°
15
79°
57°
16
80°
54°
17
80°
59°
18
76°
59°
19
78°
60°
20
77°
59°
21
77°
59°
22
76°
57°
23
75°
53°
24
72°
56°
25
78°
57°
26
75°
51°
27
67°
47°
28
66°
45°
29
67°
46°
30
66°
45°
1
65°
44°
2
66°
50°
3
71°
53°
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 94°, with overnight lows between 44° and 71°. The average high for September is 78° with an average low of 57°. 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.
