S
M
T
W
T
F
S
30
98°
75°
31
98°
74°
1
97°
73°
2
96°
74°
3
97°
74°
4
97°
73°
5
96°
73°
6
92°
72°
7
89°
72°
8
92°
71°
9
94°
71°
10
92°
70°
11
94°
71°
12
94°
71°
13
93°
72°
14
94°
67°
15
95°
69°
16
94°
67°
17
93°
69°
18
88°
67°
19
90°
66°
20
89°
66°
21
87°
67°
22
88°
64°
23
85°
62°
24
86°
65°
25
91°
62°
26
91°
63°
27
90°
66°
28
89°
66°
29
86°
65°
30
86°
65°
1
88°
64°
2
83°
64°
3
81°
63°
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 81° to 98°, with overnight lows between 62° and 75°. The average high for September is 91° with an average low of 68°. 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.
