S
M
T
W
T
F
S
30
90°
66°
31
89°
65°
1
91°
65°
2
92°
64°
3
91°
65°
4
87°
62°
5
85°
59°
6
85°
59°
7
88°
61°
8
90°
65°
9
91°
65°
10
90°
64°
11
89°
63°
12
88°
62°
13
88°
61°
14
89°
62°
15
89°
62°
16
89°
62°
17
Hist. Avg.
82°
58°
18
Hist. Avg.
82°
58°
19
Hist. Avg.
81°
57°
20
Hist. Avg.
81°
57°
21
Hist. Avg.
81°
56°
22
Hist. Avg.
80°
56°
23
Hist. Avg.
80°
56°
24
Hist. Avg.
80°
55°
25
Hist. Avg.
79°
55°
26
Hist. Avg.
79°
55°
27
Hist. Avg.
79°
54°
28
Hist. Avg.
78°
54°
29
Hist. Avg.
78°
54°
30
Hist. Avg.
78°
53°
1
Hist. Avg.
77°
53°
2
Hist. Avg.
77°
52°
3
Hist. Avg.
76°
52°
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 85° to 92°, with overnight lows between 59° and 66°. The average high for September is 89° 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.
