S
M
T
W
T
F
S
30
98°
74°
31
98°
74°
1
97°
73°
2
97°
74°
3
96°
74°
4
97°
73°
5
95°
72°
6
96°
73°
7
96°
73°
8
95°
72°
9
96°
73°
10
96°
73°
11
95°
72°
12
96°
73°
13
96°
72°
14
95°
72°
15
95°
71°
16
94°
71°
17
94°
70°
18
93°
71°
19
92°
71°
20
93°
70°
21
89°
63°
22
88°
60°
23
86°
61°
24
90°
64°
25
92°
67°
26
91°
66°
27
91°
66°
28
83°
65°
29
83°
67°
30
85°
66°
1
87°
65°
2
82°
65°
3
82°
64°
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 82° to 98°, with overnight lows between 60° and 74°. The average high for September is 92° with an average low of 69°. 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.
