S
M
T
W
T
F
S
26
85°
57°
27
85°
58°
28
83°
55°
29
82°
59°
30
86°
58°
31
86°
58°
1
85°
57°
2
80°
56°
3
78°
58°
4
85°
61°
5
79°
57°
6
80°
58°
7
82°
59°
8
81°
59°
9
81°
58°
10
80°
58°
11
80°
57°
12
79°
58°
13
81°
58°
14
81°
57°
15
80°
58°
16
81°
58°
17
80°
57°
18
79°
58°
19
80°
57°
20
79°
58°
21
81°
58°
22
82°
57°
23
81°
58°
24
78°
57°
25
79°
57°
26
81°
58°
27
82°
59°
28
82°
58°
29
81°
58°
30
80°
57°
31
82°
58°
1
82°
59°
2
83°
58°
3
81°
57°
4
80°
56°
5
80°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
Outdoor-Entertaining-December Weather in San Luis Obispo
San Luis Obispo's Outdoor-Entertaining-December 2026 forecast shows daily high temperatures ranging from 78° to 86°, with overnight lows between 55° and 61°. The average high for Outdoor-Entertaining-December is 81° with an average low of 58°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how Outdoor-Entertaining-December weather will actually feel in San Luis Obispo. See also: September | October | November.
