S
M
T
W
T
F
S
29
58°
44°
30
58°
40°
1
59°
44°
2
62°
48°
3
59°
47°
4
59°
45°
5
62°
44°
6
62°
43°
7
61°
46°
8
63°
47°
9
62°
45°
10
62°
45°
11
61°
47°
12
62°
47°
13
61°
46°
14
61°
45°
15
62°
42°
16
59°
43°
17
60°
42°
18
62°
42°
19
63°
46°
20
62°
45°
21
61°
43°
22
62°
46°
23
62°
42°
24
63°
48°
25
62°
47°
26
63°
39°
27
57°
43°
28
55°
46°
29
56°
45°
30
62°
46°
31
63°
48°
1
64°
43°
2
61°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Half Moon Bay
Half Moon Bay's December 2026 forecast shows daily high temperatures ranging from 55° to 64°, with overnight lows between 39° and 48°. The average high for December is 61° with an average low of 45°. 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 Half Moon Bay. See also: January | February | March.
