S
M
T
W
T
F
S
29
65°
52°
30
70°
48°
1
72°
41°
2
65°
43°
3
64°
39°
4
62°
36°
5
60°
38°
6
61°
45°
7
66°
49°
8
65°
51°
9
70°
51°
10
71°
48°
11
74°
47°
12
57°
37°
13
59°
39°
14
Hist. Avg.
64°
41°
15
Hist. Avg.
64°
41°
16
Hist. Avg.
64°
41°
17
Hist. Avg.
64°
41°
18
Hist. Avg.
64°
41°
19
Hist. Avg.
64°
41°
20
Hist. Avg.
63°
41°
21
Hist. Avg.
63°
40°
22
Hist. Avg.
63°
40°
23
Hist. Avg.
63°
40°
24
Hist. Avg.
63°
40°
25
Hist. Avg.
63°
40°
26
Hist. Avg.
63°
40°
27
Hist. Avg.
63°
40°
28
Hist. Avg.
63°
40°
29
Hist. Avg.
63°
40°
30
Hist. Avg.
63°
40°
31
Hist. Avg.
63°
40°
1
Hist. Avg.
63°
40°
2
Hist. Avg.
63°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in San Antonio
San Antonio's December 2026 forecast shows daily high temperatures ranging from 57° to 74°, with overnight lows between 36° and 52°. The average high for December is 65° with an average low of 44°. 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 San Antonio. See also: January | February | March.
