S
M
T
W
T
F
S
29
38°
24°
30
38°
23°
1
37°
25°
2
39°
14°
3
37°
8°
4
31°
7°
5
24°
9°
6
23°
10°
7
24°
4°
8
26°
3°
9
20°
4°
10
18°
6°
11
20°
7°
12
21°
10°
13
25°
19°
14
29°
22°
15
33°
21°
16
35°
21°
17
34°
20°
18
35°
21°
19
35°
19°
20
34°
17°
21
30°
18°
22
29°
17°
23
30°
12°
24
29°
15°
25
24°
8°
26
26°
7°
27
25°
18°
28
29°
17°
29
31°
12°
30
17°
-3°
31
12°
-2°
1
Hist. Avg.
23°
8°
2
Hist. Avg.
23°
8°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Austin
Austin's December 2026 forecast shows daily high temperatures ranging from 12° to 39°, with overnight lows between -3° and 25°. The average high for December is 28° with an average low of 13°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Austin. See also: January | February | March.
