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December weather forecast in Carmarthen

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

	745 mmHg		86%
	7.1 m/s		+11

30 November, Sunday. day, 9°; night, 4°; partly cloudy

1 December, mon

	744 mmHg		86%
	6.7 m/s		+11

1 December, Monday. day, 8°; night, 4°; partly cloudy

2 December, tue

	745 mmHg		86%
	6.7 m/s		+11

2 December, Tuesday. day, 8°; night, 4°; rain

3 December, wed

	743 mmHg		86%
	7 m/s		+11

3 December, Wednesday. day, 8°; night, 4°; rain

4 December, thu

	743 mmHg		85%
	7 m/s		+11

4 December, Thursday. day, 8°; night, 4°; rain

5 December, fri

	744 mmHg		85%
	7.4 m/s		+11

5 December, Friday. day, 8°; night, 4°; partly cloudy

6 December, sat

	745 mmHg		87%
	7.1 m/s		+11

6 December, Saturday. day, 8°; night, 4°; partly cloudy

7 December, sun

	743 mmHg		85%
	8.1 m/s		+11

7 December, Sunday. day, 8°; night, 5°; rain

8 December, mon

	744 mmHg		84%
	7.9 m/s		+11

8 December, Monday. day, 8°; night, 5°; rain

9 December, tue

	746 mmHg		84%
	7.4 m/s		+11

9 December, Tuesday. day, 8°; night, 5°; clear

10 December, wed

	746 mmHg		84%
	7 m/s		+11

10 December, Wednesday. day, 8°; night, 4°; partly cloudy

11 December, thu

	746 mmHg		86%
	6.2 m/s		+11

11 December, Thursday. day, 8°; night, 4°; partly cloudy

12 December, fri

	745 mmHg		87%
	7.2 m/s		+10

12 December, Friday. day, 8°; night, 4°; rain

13 December, sat

	745 mmHg		86%
	6.8 m/s		+10

13 December, Saturday. day, 7°; night, 4°; overcast

14 December, sun

	745 mmHg		85%
	6.9 m/s		+10

14 December, Sunday. day, 8°; night, 4°; partly cloudy

15 December, mon

	747 mmHg		86%
	6.6 m/s		+10

15 December, Monday. day, 8°; night, 4°; partly cloudy

16 December, tue

	747 mmHg		86%
	6.6 m/s		+10

16 December, Tuesday. day, 8°; night, 4°; overcast

17 December, wed

	747 mmHg		87%
	6.7 m/s		+10

17 December, Wednesday. day, 7°; night, 4°; partly cloudy

18 December, thu

	745 mmHg		90%
	7 m/s		+10

18 December, Thursday. day, 8°; night, 4°; rain

19 December, fri

	745 mmHg		88%
	6.5 m/s		+10

19 December, Friday. day, 7°; night, 3°; rain

20 December, sat

	745 mmHg		87%
	6.3 m/s		+10

20 December, Saturday. day, 7°; night, 4°; overcast

21 December, sun

	745 mmHg		89%
	7.1 m/s		+10

21 December, Sunday. day, 8°; night, 5°; rain

22 December, mon

	745 mmHg		87%
	6.9 m/s		+10

22 December, Monday. day, 8°; night, 5°; overcast

23 December, tue

	744 mmHg		88%
	7.6 m/s		+10

23 December, Tuesday. day, 9°; night, 5°; overcast

24 December, wed

	743 mmHg		87%
	7.5 m/s		+10

24 December, Wednesday. day, 8°; night, 5°; rain

25 December, thu

	744 mmHg		87%
	7 m/s		+10

25 December, Thursday. day, 8°; night, 4°; rain

26 December, fri

	744 mmHg		86%
	7.7 m/s		+10

26 December, Friday. day, 7°; night, 4°; rain

27 December, sat

	742 mmHg		87%
	7.4 m/s		+10

27 December, Saturday. day, 7°; night, 4°; rain

28 December, sun

	743 mmHg		86%
	7.1 m/s		+10

28 December, Sunday. day, 7°; night, 3°; rain

29 December, mon

	743 mmHg		86%
	7.4 m/s		+10

29 December, Monday. day, 7°; night, 3°; rain

30 December, tue

	743 mmHg		89%
	7.4 m/s		+10

30 December, Tuesday. day, 8°; night, 5°; rain

31 December, wed

	743 mmHg		88%
	7.9 m/s		+10

31 December, Wednesday. day, 8°; night, 4°; rain

1 January, thu

	743 mmHg		86%
	8.1 m/s		+10

1 January, Thursday. day, 8°; night, 4°; rain

2 January, fri

	744 mmHg		84%
	7.2 m/s		+9

2 January, Friday. day, 7°; night, 4°; partly cloudy

3 January, sat

	744 mmHg		84%
	7.8 m/s		+9

3 January, Saturday. day, 7°; night, 3°; partly cloudy

Average data for 10 years

Carmarthen December

1

sunny day

17

days with precipitation

14

cloudy days

1 sunny day; 17 days with precipitation; 14 cloudy days;

86

%

air humidity

5.1

m/s

WindS

120

mm of precipitation

(11% of annual average)

+10

°C

Water temperature

air humidity 86%; 120 millimeters of precipitation (11% of annual average); Wind southerly 5.1 Meters per second; Water temperature +10°

Weather graphs for December

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

S

S

S

SW

SW

S

S

SW

SW

S

S

S

S

S

S

S

S

S

S

S

S

SW

S

S

S

S

S

SW

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

Dublin
Manchester
Liverpool
Trowbridge
Brest
Looe
Glasgow
Bristol
Plymouth

Cities with similar weather in December

Gagra
Suhum
Baku
Pitsunda
Burgas
New Athos
The Sunny Beach
Podgorica
Vancouver

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

December in Carmarthen is the cloudiest month of the year. In December, the weather in Carmarthen is typically cold. Average daily high temperature in December is about 8 degrees above zero. On average, Carmarthen has 16 rainy, 9 partly cloudy, 5 cloudy, and 1 sunny day in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Carmarthen.

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