S
M
T
W
T
F
S
29
58°
42°
30
58°
45°
1
63°
48°
2
61°
48°
3
59°
47°
4
60°
44°
5
60°
43°
6
61°
45°
7
61°
46°
8
62°
46°
9
61°
45°
10
62°
46°
11
62°
45°
12
61°
44°
13
60°
45°
14
61°
46°
15
61°
44°
16
61°
47°
17
Hist. Avg.
59°
43°
18
Hist. Avg.
59°
43°
19
Hist. Avg.
59°
43°
20
Hist. Avg.
59°
43°
21
Hist. Avg.
59°
43°
22
Hist. Avg.
59°
43°
23
Hist. Avg.
59°
43°
24
Hist. Avg.
59°
43°
25
Hist. Avg.
59°
43°
26
Hist. Avg.
59°
43°
27
Hist. Avg.
59°
43°
28
Hist. Avg.
59°
43°
29
Hist. Avg.
59°
43°
30
Hist. Avg.
59°
43°
31
Hist. Avg.
59°
43°
1
Hist. Avg.
59°
43°
2
Hist. Avg.
59°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Half Moon Bay
Half Moon Bay's December 2026 forecast shows daily high temperatures ranging from 58° to 63°, with overnight lows between 42° 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.
