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December weather forecast in Castro Valley

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

	764 mmHg		76%
	3.8 m/s		+13

30 November, Sunday. day, 15°; night, 7°; rain

1 December, mon

	764 mmHg		77%
	4.3 m/s		+13

1 December, Monday. day, 15°; night, 8°; rain

2 December, tue

	764 mmHg		76%
	4.19 m/s		+13

2 December, Tuesday. day, 15°; night, 8°; clear

3 December, wed

	764 mmHg		76%
	3.9 m/s		+13

3 December, Wednesday. day, 15°; night, 8°; clear

4 December, thu

	765 mmHg		76%
	3.4 m/s		+13

4 December, Thursday. day, 15°; night, 7°; clear

5 December, fri

	764 mmHg		78%
	3.5 m/s		+13

5 December, Friday. day, 15°; night, 8°; overcast

6 December, sat

	764 mmHg		80%
	3.8 m/s		+13

6 December, Saturday. day, 15°; night, 7°; rain

7 December, sun

	764 mmHg		80%
	4 m/s		+13

7 December, Sunday. day, 15°; night, 8°; clear

8 December, mon

	765 mmHg		80%
	3.6 m/s		+12

8 December, Monday. day, 14°; night, 7°; overcast

9 December, tue

	765 mmHg		77%
	3.9 m/s		+12

9 December, Tuesday. day, 15°; night, 7°; partly cloudy

10 December, wed

	765 mmHg		77%
	4.3 m/s		+13

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

11 December, thu

	764 mmHg		79%
	3.9 m/s		+13

11 December, Thursday. day, 14°; night, 7°; partly cloudy

12 December, fri

	763 mmHg		83%
	3.9 m/s		+13

12 December, Friday. day, 14°; night, 8°; rain

13 December, sat

	764 mmHg		84%
	4.19 m/s		+12

13 December, Saturday. day, 14°; night, 8°; rain

14 December, sun

	764 mmHg		81%
	4.9 m/s		+12

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

15 December, mon

	765 mmHg		79%
	4.1 m/s		+12

15 December, Monday. day, 14°; night, 7°; partly cloudy

16 December, tue

	765 mmHg		77%
	4.3 m/s		+12

16 December, Tuesday. day, 14°; night, 6°; clear

17 December, wed

	764 mmHg		77%
	3.9 m/s		+12

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

18 December, thu

	764 mmHg		77%
	3.8 m/s		+12

18 December, Thursday. day, 14°; night, 6°; clear

19 December, fri

	764 mmHg		79%
	3.8 m/s		+12

19 December, Friday. day, 14°; night, 7°; partly cloudy

20 December, sat

	764 mmHg		79%
	3.8 m/s		+12

20 December, Saturday. day, 13°; night, 6°; partly cloudy

21 December, sun

	764 mmHg		79%
	4 m/s		+12

21 December, Sunday. day, 13°; night, 7°; rain

22 December, mon

	763 mmHg		76%
	4.3 m/s		+12

22 December, Monday. day, 14°; night, 7°; rain

23 December, tue

	765 mmHg		75%
	3.6 m/s		+12

23 December, Tuesday. day, 14°; night, 7°; clear

24 December, wed

	765 mmHg		77%
	4 m/s		+12

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

25 December, thu

	765 mmHg		75%
	4 m/s		+12

25 December, Thursday. day, 13°; night, 6°; clear

26 December, fri

	765 mmHg		76%
	4.4 m/s		+12

26 December, Friday. day, 13°; night, 6°; clear

27 December, sat

	765 mmHg		79%
	4.3 m/s		+12

27 December, Saturday. day, 13°; night, 6°; overcast

28 December, sun

	765 mmHg		78%
	3.6 m/s		+12

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

29 December, mon

	764 mmHg		79%
	4.1 m/s		+12

29 December, Monday. day, 14°; night, 7°; rain

30 December, tue

	764 mmHg		82%
	4.1 m/s		+12

30 December, Tuesday. day, 14°; night, 7°; rain

31 December, wed

	764 mmHg		79%
	4.5 m/s		+12

31 December, Wednesday. day, 14°; night, 7°; overcast

1 January, thu

	764 mmHg		77%
	4.19 m/s		+11

1 January, Thursday. day, 13°; night, 6°; clear

2 January, fri

	764 mmHg		79%
	3.7 m/s		+11

2 January, Friday. day, 13°; night, 6°; rain

3 January, sat

	764 mmHg		81%
	3.8 m/s		+11

3 January, Saturday. day, 13°; night, 6°; rain

Average data for 10 years

Castro Valley December

9

sunny days

10

days with precipitation

10

cloudy days

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

78

%

air humidity

2.4

m/s

WindS

98

mm of precipitation

(20% of annual average)

+12

°C

Water temperature

air humidity 78%; 98 millimeters of precipitation (20% of annual average); Wind southerly 2.4 Meters per second; Water temperature +12°

Weather graphs for December

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

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S

S

SE

SE

S

S

S

S

SE

S

S

S

S

S

SE

SE

SE

SE

SE

SE

S

S

SE

SE

S

S

S

SE

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
Marmaris
Athens
Lisbon
Heraklion
Nice
Salou

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

In December, the weather in Castro Valley is typically warm. Average daily high temperature in December is about 14 degrees above zero. On average, Castro Valley has 10 rainy, 9 sunny, 8 partly cloudy, and 4 cloudy days in December. The rains are usually heavy. December as well as January is considered the most uncomfortable time to visit Castro Valley.

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