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December weather forecast in Half Moon Bay

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

30 November, sun

	755 mmHg		80%
	5.4 m/s		+13

30 November, Sunday. day, 14°; night, 10°; rain

1 December, mon

	755 mmHg		81%
	5.8 m/s		+13

1 December, Monday. day, 14°; night, 11°; rain

2 December, tue

	755 mmHg		80%
	5.6 m/s		+13

2 December, Tuesday. day, 14°; night, 10°; clear

3 December, wed

	756 mmHg		80%
	5.3 m/s		+13

3 December, Wednesday. day, 13°; night, 10°; clear

4 December, thu

	756 mmHg		80%
	4.8 m/s		+13

4 December, Thursday. day, 14°; night, 10°; partly cloudy

5 December, fri

	755 mmHg		81%
	4.8 m/s		+13

5 December, Friday. day, 14°; night, 10°; overcast

6 December, sat

	755 mmHg		83%
	5.1 m/s		+13

6 December, Saturday. day, 14°; night, 10°; rain

7 December, sun

	755 mmHg		83%
	5.3 m/s		+13

7 December, Sunday. day, 14°; night, 10°; rain

8 December, mon

	756 mmHg		82%
	5.4 m/s		+13

8 December, Monday. day, 13°; night, 10°; overcast

9 December, tue

	756 mmHg		80%
	5.3 m/s		+13

9 December, Tuesday. day, 13°; night, 10°; partly cloudy

10 December, wed

	756 mmHg		80%
	5.7 m/s		+13

10 December, Wednesday. day, 13°; night, 10°; clear

11 December, thu

	756 mmHg		81%
	5.3 m/s		+13

11 December, Thursday. day, 13°; night, 10°; partly cloudy

12 December, fri

	755 mmHg		85%
	5.6 m/s		+13

12 December, Friday. day, 13°; night, 10°; rain

13 December, sat

	755 mmHg		85%
	5.6 m/s		+13

13 December, Saturday. day, 13°; night, 10°; rain

14 December, sun

	756 mmHg		83%
	6.5 m/s		+13

14 December, Sunday. day, 13°; night, 10°; rain

15 December, mon

	757 mmHg		80%
	5.7 m/s		+12

15 December, Monday. day, 13°; night, 9°; clear

16 December, tue

	756 mmHg		79%
	5.8 m/s		+13

16 December, Tuesday. day, 13°; night, 9°; partly cloudy

17 December, wed

	756 mmHg		79%
	5.5 m/s		+13

17 December, Wednesday. day, 13°; night, 9°; partly cloudy

18 December, thu

	756 mmHg		79%
	5.4 m/s		+13

18 December, Thursday. day, 13°; night, 9°; clear

19 December, fri

	756 mmHg		81%
	5.4 m/s		+12

19 December, Friday. day, 13°; night, 9°; clear

20 December, sat

	755 mmHg		80%
	5.4 m/s		+12

20 December, Saturday. day, 12°; night, 9°; partly cloudy

21 December, sun

	755 mmHg		82%
	5.9 m/s		+12

21 December, Sunday. day, 13°; night, 10°; rain

22 December, mon

	755 mmHg		80%
	6.1 m/s		+12

22 December, Monday. day, 13°; night, 10°; rain

23 December, tue

	756 mmHg		77%
	5 m/s		+12

23 December, Tuesday. day, 13°; night, 9°; clear

24 December, wed

	757 mmHg		80%
	5.4 m/s		+12

24 December, Wednesday. day, 13°; night, 9°; partly cloudy

25 December, thu

	756 mmHg		77%
	5.8 m/s		+12

25 December, Thursday. day, 12°; night, 9°; clear

26 December, fri

	756 mmHg		78%
	6.3 m/s		+12

26 December, Friday. day, 12°; night, 9°; clear

27 December, sat

	757 mmHg		81%
	6.1 m/s		+12

27 December, Saturday. day, 12°; night, 9°; partly cloudy

28 December, sun

	756 mmHg		81%
	5.3 m/s		+12

28 December, Sunday. day, 12°; night, 9°; rain

29 December, mon

	755 mmHg		82%
	5.7 m/s		+12

29 December, Monday. day, 13°; night, 9°; rain

30 December, tue

	755 mmHg		85%
	5.5 m/s		+12

30 December, Tuesday. day, 13°; night, 9°; rain

31 December, wed

	755 mmHg		81%
	6.1 m/s		+12

31 December, Wednesday. day, 12°; night, 9°; overcast

1 January, thu

	755 mmHg		80%
	6.1 m/s		+12

1 January, Thursday. day, 12°; night, 9°; clear

2 January, fri

	755 mmHg		81%
	5 m/s		+12

2 January, Friday. day, 13°; night, 9°; rain

3 January, sat

	755 mmHg		82%
	5 m/s		+12

3 January, Saturday. day, 12°; night, 9°; rain

Average data for 10 years

Half Moon Bay December

9

sunny days

11

days with precipitation

9

cloudy days

9 sunny days; 11 days with precipitation; 9 cloudy days;

81

%

air humidity

3.6

m/s

WindS

113

mm of precipitation

(20% of annual average)

+13

°C

Water temperature

air humidity 81%; 113 millimeters of precipitation (20% of annual average); Wind southerly 3.6 Meters per second; Water temperature +13°

Weather graphs for December

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

SW

SW

SW

S

S

S

S

S

S

S

S

S

SW

SW

SW

S

S

S

S

S

S

S

S

S

S

S

S

S

S

SW

SW

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

Daytime temperature

Night-time temperature

Cities near you

San Francisco
Sacramento
Oakland
Redding
Monterey
San Jose
Reno
Stanford
San Luis Obispo

Cities with similar weather in December

Antalya
Barcelona
Rome
Marmaris
Athens
Lisbon
Heraklion
Hammamet
Nice

The weather forecast for December 2025 is based on historical data from the past 10 years.

In December, the weather in Half Moon Bay is typically warm. Average daily high temperature in December is about 13 degrees above zero. On average, Half Moon Bay has 11 rainy, 9 sunny, 8 partly cloudy, and 3 cloudy days in December. The rains are usually heavy. December as well as January, February, and March is considered the most uncomfortable time to visit Half Moon Bay.

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