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December weather forecast in San Mateo

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

	761 mmHg		79%
	5.3 m/s		+13

30 November, Sunday. day, 14°; night, 9°; rain

1 December, mon

	761 mmHg		80%
	5.6 m/s		+13

1 December, Monday. day, 14°; night, 10°; rain

2 December, tue

	761 mmHg		79%
	5.4 m/s		+13

2 December, Tuesday. day, 14°; night, 9°; clear

3 December, wed

	761 mmHg		79%
	5.1 m/s		+13

3 December, Wednesday. day, 14°; night, 9°; clear

4 December, thu

	762 mmHg		79%
	4.6 m/s		+13

4 December, Thursday. day, 14°; night, 9°; partly cloudy

5 December, fri

	761 mmHg		80%
	4.69 m/s		+13

5 December, Friday. day, 14°; night, 9°; overcast

6 December, sat

	761 mmHg		82%
	5.2 m/s		+13

6 December, Saturday. day, 14°; night, 9°; rain

7 December, sun

	761 mmHg		83%
	5.3 m/s		+13

7 December, Sunday. day, 14°; night, 9°; rain

8 December, mon

	762 mmHg		82%
	5 m/s		+13

8 December, Monday. day, 13°; night, 9°; overcast

9 December, tue

	762 mmHg		80%
	5.2 m/s		+13

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

10 December, wed

	762 mmHg		79%
	5.8 m/s		+13

10 December, Wednesday. day, 13°; night, 9°; clear

11 December, thu

	761 mmHg		81%
	5.3 m/s		+13

11 December, Thursday. day, 13°; night, 9°; partly cloudy

12 December, fri

	760 mmHg		84%
	5.3 m/s		+13

12 December, Friday. day, 13°; night, 9°; rain

13 December, sat

	761 mmHg		85%
	5.5 m/s		+13

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

14 December, sun

	761 mmHg		83%
	6.3 m/s		+13

14 December, Sunday. day, 13°; night, 9°; rain

15 December, mon

	762 mmHg		80%
	5.5 m/s		+12

15 December, Monday. day, 13°; night, 8°; partly cloudy

16 December, tue

	762 mmHg		79%
	5.7 m/s		+13

16 December, Tuesday. day, 13°; night, 8°; clear

17 December, wed

	761 mmHg		78%
	5.4 m/s		+13

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

18 December, thu

	761 mmHg		79%
	5.2 m/s		+13

18 December, Thursday. day, 13°; night, 8°; clear

19 December, fri

	761 mmHg		81%
	5.3 m/s		+12

19 December, Friday. day, 13°; night, 8°; partly cloudy

20 December, sat

	761 mmHg		81%
	5.2 m/s		+12

20 December, Saturday. day, 13°; night, 8°; partly cloudy

21 December, sun

	761 mmHg		81%
	5.6 m/s		+12

21 December, Sunday. day, 13°; night, 9°; rain

22 December, mon

	760 mmHg		79%
	5.8 m/s		+12

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

23 December, tue

	762 mmHg		77%
	4.69 m/s		+12

23 December, Tuesday. day, 13°; night, 8°; clear

24 December, wed

	762 mmHg		79%
	5.3 m/s		+12

24 December, Wednesday. day, 13°; night, 8°; partly cloudy

25 December, thu

	762 mmHg		77%
	5.6 m/s		+12

25 December, Thursday. day, 12°; night, 8°; clear

26 December, fri

	762 mmHg		77%
	6.1 m/s		+12

26 December, Friday. day, 12°; night, 8°; clear

27 December, sat

	762 mmHg		81%
	5.9 m/s		+12

27 December, Saturday. day, 13°; night, 8°; overcast

28 December, sun

	762 mmHg		81%
	5 m/s		+12

28 December, Sunday. day, 13°; night, 8°; rain

29 December, mon

	761 mmHg		82%
	5.5 m/s		+12

29 December, Monday. day, 13°; night, 8°; rain

30 December, tue

	761 mmHg		84%
	5.5 m/s		+12

30 December, Tuesday. day, 13°; night, 8°; rain

31 December, wed

	761 mmHg		82%
	5.9 m/s		+12

31 December, Wednesday. day, 13°; night, 8°; partly cloudy

1 January, thu

	761 mmHg		79%
	5.9 m/s		+12

1 January, Thursday. day, 13°; night, 8°; clear

2 January, fri

	761 mmHg		81%
	5.1 m/s		+12

2 January, Friday. day, 13°; night, 8°; rain

3 January, sat

	761 mmHg		82%
	5.2 m/s		+12

3 January, Saturday. day, 12°; night, 8°; overcast

Average data for 10 years

San Mateo December

8

sunny days

11

days with precipitation

10

cloudy days

8 sunny days; 11 days with precipitation; 10 cloudy days;

81

%

air humidity

3.4

m/s

WindS

119

mm of precipitation

(21% of annual average)

+13

°C

Water temperature

air humidity 81%; 119 millimeters of precipitation (21% of annual average); Wind southerly 3.4 Meters per second; Water temperature +13°

Weather graphs for December

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

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S

S

S

S

S

S

S

S

S

S

S

S

SW

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

S

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
Tunis
Marmaris
Athens
Lisbon
Heraklion
Hammamet

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

In December, the weather in San Mateo is typically warm. Average daily high temperature in December is about 13 degrees above zero. On average, San Mateo has 11 rainy, 9 partly cloudy, 8 sunny, 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 San Mateo.

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