S
M
T
W
T
F
S
30
90°
60°
31
84°
60°
1
85°
63°
2
88°
65°
3
88°
65°
4
87°
64°
5
88°
65°
6
90°
64°
7
87°
63°
8
86°
62°
9
84°
62°
10
85°
60°
11
86°
62°
12
86°
63°
13
87°
63°
14
87°
62°
15
Hist. Avg.
84°
59°
16
Hist. Avg.
84°
58°
17
Hist. Avg.
83°
58°
18
Hist. Avg.
83°
57°
19
Hist. Avg.
83°
57°
20
Hist. Avg.
82°
57°
21
Hist. Avg.
82°
56°
22
Hist. Avg.
82°
56°
23
Hist. Avg.
81°
55°
24
Hist. Avg.
81°
55°
25
Hist. Avg.
80°
54°
26
Hist. Avg.
80°
54°
27
Hist. Avg.
80°
54°
28
Hist. Avg.
79°
53°
29
Hist. Avg.
79°
53°
30
Hist. Avg.
78°
52°
1
Hist. Avg.
78°
52°
2
Hist. Avg.
78°
52°
3
Hist. Avg.
77°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Austin
Austin's September 2026 forecast shows daily high temperatures ranging from 84° to 90°, with overnight lows between 60° and 65°. The average high for September is 87° with an average low of 63°. 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.
