S
M
T
W
T
F
S
29
59°
44°
30
57°
48°
1
56°
45°
2
61°
46°
3
61°
48°
4
62°
49°
5
60°
42°
6
56°
45°
7
56°
42°
8
57°
46°
9
55°
41°
10
55°
46°
11
54°
43°
12
55°
44°
13
54°
41°
14
55°
42°
15
55°
48°
16
56°
48°
17
59°
47°
18
61°
47°
19
60°
39°
20
58°
38°
21
54°
39°
22
55°
40°
23
55°
41°
24
54°
41°
25
54°
42°
26
56°
43°
27
55°
40°
28
59°
39°
29
56°
39°
30
58°
40°
31
57°
40°
1
59°
41°
2
61°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Millbrae
Millbrae's December 2026 forecast shows daily high temperatures ranging from 54° to 62°, with overnight lows between 38° and 49°. The average high for December is 57° with an average low of 43°. 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 Millbrae. See also: January | February | March.
