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December weather forecast in San Ramon

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

	748 mmHg		75%
	3.2 m/s		+13

30 November, Sunday. day, 15°; night, 6°; rain

1 December, mon

	748 mmHg		75%
	3.8 m/s		+13

1 December, Monday. day, 15°; night, 7°; rain

2 December, tue

	748 mmHg		74%
	3.6 m/s		+13

2 December, Tuesday. day, 15°; night, 7°; clear

3 December, wed

	749 mmHg		75%
	3.4 m/s		+13

3 December, Wednesday. day, 15°; night, 6°; clear

4 December, thu

	749 mmHg		75%
	2.9 m/s		+13

4 December, Thursday. day, 15°; night, 6°; clear

5 December, fri

	748 mmHg		76%
	2.9 m/s		+13

5 December, Friday. day, 15°; night, 7°; overcast

6 December, sat

	748 mmHg		79%
	3.3 m/s		+13

6 December, Saturday. day, 15°; night, 6°; rain

7 December, sun

	748 mmHg		78%
	3.4 m/s		+13

7 December, Sunday. day, 15°; night, 7°; clear

8 December, mon

	749 mmHg		79%
	3 m/s		+12

8 December, Monday. day, 14°; night, 6°; partly cloudy

9 December, tue

	749 mmHg		75%
	3.2 m/s		+12

9 December, Tuesday. day, 14°; night, 7°; partly cloudy

10 December, wed

	749 mmHg		77%
	3.6 m/s		+13

10 December, Wednesday. day, 14°; night, 7°; partly cloudy

11 December, thu

	748 mmHg		78%
	3.3 m/s		+13

11 December, Thursday. day, 14°; night, 6°; partly cloudy

12 December, fri

	748 mmHg		81%
	3.3 m/s		+13

12 December, Friday. day, 14°; night, 7°; rain

13 December, sat

	748 mmHg		82%
	3.6 m/s		+12

13 December, Saturday. day, 14°; night, 7°; rain

14 December, sun

	748 mmHg		79%
	4.19 m/s		+12

14 December, Sunday. day, 14°; night, 6°; rain

15 December, mon

	750 mmHg		78%
	3.6 m/s		+12

15 December, Monday. day, 13°; night, 6°; partly cloudy

16 December, tue

	749 mmHg		76%
	3.6 m/s		+12

16 December, Tuesday. day, 14°; night, 5°; clear

17 December, wed

	749 mmHg		76%
	3.2 m/s		+12

17 December, Wednesday. day, 13°; night, 6°; partly cloudy

18 December, thu

	748 mmHg		76%
	3.2 m/s		+12

18 December, Thursday. day, 14°; night, 5°; clear

19 December, fri

	749 mmHg		78%
	3.3 m/s		+12

19 December, Friday. day, 14°; night, 6°; partly cloudy

20 December, sat

	748 mmHg		77%
	3.3 m/s		+12

20 December, Saturday. day, 13°; night, 5°; partly cloudy

21 December, sun

	748 mmHg		78%
	3.3 m/s		+12

21 December, Sunday. day, 13°; night, 6°; rain

22 December, mon

	747 mmHg		76%
	3.8 m/s		+12

22 December, Monday. day, 13°; night, 7°; rain

23 December, tue

	749 mmHg		74%
	3.2 m/s		+12

23 December, Tuesday. day, 13°; night, 5°; clear

24 December, wed

	750 mmHg		76%
	3.4 m/s		+12

24 December, Wednesday. day, 13°; night, 5°; partly cloudy

25 December, thu

	749 mmHg		75%
	3.4 m/s		+12

25 December, Thursday. day, 13°; night, 4°; clear

26 December, fri

	749 mmHg		75%
	3.6 m/s		+12

26 December, Friday. day, 13°; night, 5°; clear

27 December, sat

	749 mmHg		78%
	3.7 m/s		+12

27 December, Saturday. day, 13°; night, 5°; overcast

28 December, sun

	749 mmHg		76%
	3.1 m/s		+12

28 December, Sunday. day, 13°; night, 6°; rain

29 December, mon

	748 mmHg		78%
	3.5 m/s		+12

29 December, Monday. day, 13°; night, 6°; rain

30 December, tue

	748 mmHg		81%
	3.5 m/s		+12

30 December, Tuesday. day, 13°; night, 6°; rain

31 December, wed

	748 mmHg		78%
	3.9 m/s		+12

31 December, Wednesday. day, 14°; night, 6°; overcast

1 January, thu

	748 mmHg		76%
	3.5 m/s		+11

1 January, Thursday. day, 13°; night, 5°; clear

2 January, fri

	748 mmHg		79%
	3.1 m/s		+11

2 January, Friday. day, 13°; night, 5°; partly cloudy

3 January, sat

	748 mmHg		81%
	3.2 m/s		+11

3 January, Saturday. day, 13°; night, 5°; rain

Average data for 10 years

San Ramon December

9

sunny days

10

days with precipitation

9

cloudy days

9 sunny days; 10 days with precipitation; 9 cloudy days;

77

%

air humidity

2.09

m/s

WindSE

92

mm of precipitation

(20% of annual average)

+12

°C

Water temperature

air humidity 77%; 92 millimeters of precipitation (20% of annual average); Wind south-easterly 2.09 Meters per second; Water temperature +12°

Weather graphs for December

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

S

SE

S

SE

SE

S

S

S

SE

SE

S

S

S

S

S

SE

SE

SE

SE

SE

SE

SE

SE

SE

SE

S

S

SE

SE

SE

S

1

Average data for 10 years

2

3

4

5

6

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8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

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31

Daytime temperature

Night-time temperature

Cities near you

San Francisco
Sacramento
Oakland
Redding
Monterey
San Jose
Reno
Santa Barbara
Stanford

Cities with similar weather in December

Antalya
Kemer
Barcelona
Rome
Batumi
Athens
Budva
Heraklion
Nice

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

December in San Ramon is the coldest month of the year. In December, the weather in San Ramon is typically warm. Average daily high temperature in December is about 14 degrees above zero. On average, San Ramon has 10 rainy, 9 sunny, 9 partly cloudy, and 3 cloudy days in December. The rains are usually heavy. December as well as January is considered the most uncomfortable time to visit San Ramon.

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