S
M
T
W
T
F
S
29
69°
52°
30
69°
48°
1
66°
43°
2
66°
43°
3
67°
45°
4
69°
51°
5
68°
48°
6
67°
50°
7
70°
46°
8
64°
42°
9
64°
43°
10
69°
49°
11
72°
50°
12
72°
50°
13
71°
49°
14
70°
42°
15
67°
44°
16
68°
41°
17
65°
40°
18
63°
39°
19
64°
40°
20
65°
41°
21
67°
41°
22
67°
42°
23
64°
40°
24
63°
41°
25
68°
41°
26
67°
45°
27
70°
41°
28
66°
41°
29
64°
43°
30
68°
43°
31
71°
42°
1
71°
45°
2
70°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in San Luis
San Luis's December 2026 forecast shows daily high temperatures ranging from 63° to 72°, with overnight lows between 39° and 52°. The average high for December is 67° 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 Luis. See also: January | February | March.
