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December weather forecast in Belfast

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

	746 mmHg		85%
	7.1 m/s		+11

30 November, Sunday. day, 8°; night, 5°; overcast

1 December, mon

	746 mmHg		86%
	6.8 m/s		+11

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

2 December, tue

	746 mmHg		86%
	6.6 m/s		+11

2 December, Tuesday. day, 7°; night, 4°; overcast

3 December, wed

	744 mmHg		87%
	6.7 m/s		+11

3 December, Wednesday. day, 7°; night, 4°; rain

4 December, thu

	744 mmHg		86%
	6.9 m/s		+11

4 December, Thursday. day, 7°; night, 4°; partly cloudy

5 December, fri

	745 mmHg		85%
	7.7 m/s		+11

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

6 December, sat

	746 mmHg		88%
	6.9 m/s		+11

6 December, Saturday. day, 8°; night, 4°; rain

7 December, sun

	744 mmHg		86%
	8.1 m/s		+10

7 December, Sunday. day, 7°; night, 4°; rain

8 December, mon

	744 mmHg		85%
	7.5 m/s		+10

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

9 December, tue

	747 mmHg		86%
	7.2 m/s		+10

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

10 December, wed

	748 mmHg		86%
	6.5 m/s		+10

10 December, Wednesday. day, 7°; night, 4°; clear

11 December, thu

	748 mmHg		87%
	5.9 m/s		+10

11 December, Thursday. day, 7°; night, 4°; partly cloudy

12 December, fri

	747 mmHg		88%
	6.4 m/s		+10

12 December, Friday. day, 7°; night, 4°; overcast

13 December, sat

	746 mmHg		86%
	6.9 m/s		+10

13 December, Saturday. day, 7°; night, 4°; partly cloudy

14 December, sun

	747 mmHg		85%
	7.3 m/s		+10

14 December, Sunday. day, 8°; night, 4°; overcast

15 December, mon

	749 mmHg		85%
	6.5 m/s		+10

15 December, Monday. day, 7°; night, 4°; partly cloudy

16 December, tue

	749 mmHg		85%
	6.9 m/s		+10

16 December, Tuesday. day, 7°; night, 4°; partly cloudy

17 December, wed

	748 mmHg		86%
	7 m/s		+10

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

18 December, thu

	747 mmHg		88%
	6.8 m/s		+10

18 December, Thursday. day, 7°; night, 4°; rain

19 December, fri

	747 mmHg		86%
	6.9 m/s		+10

19 December, Friday. day, 7°; night, 4°; partly cloudy

20 December, sat

	747 mmHg		86%
	6.5 m/s		+10

20 December, Saturday. day, 6°; night, 3°; overcast

21 December, sun

	746 mmHg		87%
	7 m/s		+10

21 December, Sunday. day, 7°; night, 4°; rain

22 December, mon

	745 mmHg		88%
	7 m/s		+10

22 December, Monday. day, 7°; night, 4°; rain

23 December, tue

	745 mmHg		87%
	7.3 m/s		+10

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

24 December, wed

	744 mmHg		86%
	7.3 m/s		+10

24 December, Wednesday. day, 7°; night, 4°; rain

25 December, thu

	745 mmHg		87%
	6.7 m/s		+10

25 December, Thursday. day, 6°; night, 3°; rain

26 December, fri

	744 mmHg		87%
	7.3 m/s		+10

26 December, Friday. day, 6°; night, 3°; rain

27 December, sat

	742 mmHg		89%
	6.8 m/s		+10

27 December, Saturday. day, 6°; night, 3°; rain

28 December, sun

	744 mmHg		87%
	7 m/s		+9

28 December, Sunday. day, 6°; night, 3°; clear

29 December, mon

	744 mmHg		85%
	8.1 m/s		+9

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

30 December, tue

	743 mmHg		87%
	7.4 m/s		+9

30 December, Tuesday. day, 7°; night, 4°; rain

31 December, wed

	743 mmHg		86%
	7.7 m/s		+9

31 December, Wednesday. day, 7°; night, 4°; rain

1 January, thu

	744 mmHg		85%
	7.7 m/s		+9

1 January, Thursday. day, 7°; night, 3°; partly cloudy

2 January, fri

	745 mmHg		84%
	7.3 m/s		+9

2 January, Friday. day, 6°; night, 4°; rain

3 January, sat

	745 mmHg		83%
	7.8 m/s		+9

3 January, Saturday. day, 7°; night, 4°; rain

Average data for 10 years

Belfast December

3

sunny days

16

days with precipitation

14

cloudy days

3 sunny days; 16 days with precipitation; 14 cloudy days;

86

%

air humidity

5.2

m/s

WindSW

91

mm of precipitation

(9% of annual average)

+10

°C

Water temperature

air humidity 86%; 91 millimeters of precipitation (9% of annual average); Wind south-westerly 5.2 Meters per second; Water temperature +10°

Weather graphs for December

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

SW

SW

SW

SW

SW

S

SW

SW

SW

S

S

S

S

SW

SW

SW

S

S

S

SW

SW

SW

S

SW

SW

SW

SW

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
Edinburgh
Manchester
Liverpool
Carrickfinn
Glasgow
Cork
Galway
Wicklow

Cities with similar weather in December

New York
Varna
Copenhagen
The Golden Sands
Bergen
Bruges
Busan
Albena
Rostock

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

In December, the weather in Belfast is typically cold. Average daily high temperature in December is about 7 degrees above zero. On average, Belfast has 15 rainy, 8 partly cloudy, 5 cloudy, and 3 sunny days in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Belfast.

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