S
M
T
W
T
F
S
30
72°
54°
31
72°
56°
1
73°
60°
2
75°
61°
3
79°
61°
4
78°
60°
5
76°
60°
6
75°
59°
7
70°
59°
8
71°
57°
9
73°
58°
10
75°
58°
11
76°
57°
12
78°
58°
13
78°
58°
14
77°
57°
15
74°
56°
16
67°
55°
17
70°
56°
18
73°
55°
19
74°
56°
20
72°
56°
21
75°
52°
22
76°
52°
23
76°
48°
24
73°
49°
25
74°
40°
26
68°
51°
27
71°
53°
28
73°
54°
29
75°
48°
30
73°
37°
1
69°
37°
2
65°
45°
3
64°
46°
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 64° to 79°, with overnight lows between 37° and 61°. The average high for September is 73° with an average low of 54°. 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.
