S
M
T
W
T
F
S
30
85°
65°
31
80°
65°
1
80°
64°
2
82°
60°
3
81°
59°
4
80°
56°
5
80°
56°
6
81°
58°
7
83°
59°
8
86°
62°
9
85°
61°
10
86°
62°
11
79°
53°
12
78°
54°
13
78°
52°
14
77°
51°
15
79°
56°
16
81°
51°
17
77°
54°
18
77°
50°
19
78°
47°
20
74°
47°
21
74°
48°
22
75°
47°
23
75°
47°
24
76°
55°
25
78°
55°
26
74°
54°
27
73°
54°
28
76°
49°
29
75°
45°
30
73°
50°
1
74°
53°
2
80°
41°
3
80°
40°
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 73° to 86°, with overnight lows between 40° and 65°. The average high for September is 79° 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.
