S
M
T
W
T
F
S
30
81°
67°
31
84°
67°
1
89°
65°
2
86°
64°
3
87°
71°
4
90°
72°
5
76°
69°
6
73°
67°
7
74°
65°
8
79°
64°
9
80°
60°
10
80°
58°
11
80°
58°
12
72°
56°
13
70°
49°
14
63°
50°
15
68°
55°
16
72°
51°
17
66°
61°
18
63°
59°
19
62°
58°
20
68°
49°
21
60°
49°
22
63°
49°
23
64°
50°
24
62°
56°
25
68°
52°
26
62°
57°
27
70°
59°
28
72°
57°
29
66°
51°
30
67°
52°
1
68°
53°
2
73°
51°
3
68°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Austin
Austin's September 2026 forecast shows daily high temperatures ranging from 62° to 73°, with overnight lows between 49° and 59°. The average high for September is 67° with an average low of 53°. 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 Austin. See also: October | November | December.
