S
M
T
W
T
F
S
30
73°
61°
31
74°
61°
1
84°
67°
2
81°
62°
3
81°
64°
4
74°
62°
5
71°
55°
6
70°
50°
7
70°
43°
8
75°
47°
9
79°
62°
10
77°
60°
11
72°
50°
12
69°
64°
13
77°
53°
14
64°
44°
15
70°
59°
16
79°
60°
17
73°
51°
18
69°
49°
19
67°
45°
20
64°
43°
21
66°
44°
22
67°
46°
23
69°
49°
24
68°
44°
25
62°
43°
26
67°
48°
27
71°
49°
28
70°
46°
29
63°
42°
30
68°
49°
1
69°
46°
2
64°
45°
3
66°
47°
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 79°, with overnight lows between 42° and 64°. The average high for September is 68° with an average low of 49°. 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.
