S
M
T
W
T
F
S
30
97°
64°
31
97°
72°
1
99°
73°
2
100°
73°
3
100°
73°
4
100°
73°
5
102°
73°
6
102°
75°
7
95°
73°
8
98°
74°
9
98°
72°
10
97°
69°
11
85°
69°
12
93°
71°
13
92°
71°
14
91°
70°
15
87°
69°
16
86°
66°
17
86°
65°
18
83°
62°
19
81°
59°
20
79°
61°
21
81°
60°
22
85°
64°
23
85°
64°
24
84°
65°
25
86°
65°
26
84°
64°
27
83°
64°
28
84°
63°
29
84°
64°
30
83°
64°
1
81°
57°
2
73°
53°
3
71°
51°
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 98°, with overnight lows between 51° and 74°. The average high for September is 85° with an average low of 64°. 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.
