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December weather forecast in Portoroz

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		72%
	6.5 m/s		+14

30 November, Sunday. day, 10°; night, 7°; partly cloudy

1 December, mon

	761 mmHg		72%
	6.7 m/s		+14

1 December, Monday. day, 10°; night, 7°; partly cloudy

2 December, tue

	761 mmHg		75%
	6 m/s		+14

2 December, Tuesday. day, 10°; night, 7°; rain

3 December, wed

	761 mmHg		73%
	6.2 m/s		+14

3 December, Wednesday. day, 9°; night, 7°; rain

4 December, thu

	761 mmHg		73%
	5.8 m/s		+14

4 December, Thursday. day, 9°; night, 7°; rain

5 December, fri

	761 mmHg		73%
	5.8 m/s		+14

5 December, Friday. day, 10°; night, 7°; rain

6 December, sat

	762 mmHg		73%
	5 m/s		+14

6 December, Saturday. day, 9°; night, 7°; partly cloudy

7 December, sun

	763 mmHg		72%
	5.2 m/s		+14

7 December, Sunday. day, 9°; night, 6°; clear

8 December, mon

	763 mmHg		73%
	6.2 m/s		+14

8 December, Monday. day, 9°; night, 6°; rain

9 December, tue

	762 mmHg		72%
	6.5 m/s		+13

9 December, Tuesday. day, 9°; night, 6°; rain

10 December, wed

	763 mmHg		71%
	5.8 m/s		+13

10 December, Wednesday. day, 9°; night, 6°; clear

11 December, thu

	763 mmHg		71%
	5.4 m/s		+13

11 December, Thursday. day, 9°; night, 6°; clear

12 December, fri

	762 mmHg		72%
	5.2 m/s		+13

12 December, Friday. day, 9°; night, 6°; clear

13 December, sat

	763 mmHg		73%
	5.8 m/s		+13

13 December, Saturday. day, 8°; night, 5°; overcast

14 December, sun

	762 mmHg		74%
	5.7 m/s		+13

14 December, Sunday. day, 8°; night, 5°; clear

15 December, mon

	763 mmHg		73%
	6 m/s		+13

15 December, Monday. day, 9°; night, 5°; clear

16 December, tue

	764 mmHg		74%
	5.5 m/s		+13

16 December, Tuesday. day, 8°; night, 6°; partly cloudy

17 December, wed

	764 mmHg		74%
	5 m/s		+12

17 December, Wednesday. day, 8°; night, 6°; partly cloudy

18 December, thu

	765 mmHg		73%
	4.69 m/s		+12

18 December, Thursday. day, 8°; night, 5°; clear

19 December, fri

	764 mmHg		74%
	4.5 m/s		+12

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

20 December, sat

	764 mmHg		74%
	5 m/s		+12

20 December, Saturday. day, 8°; night, 5°; partly cloudy

21 December, sun

	764 mmHg		74%
	4.9 m/s		+13

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

22 December, mon

	764 mmHg		76%
	4.5 m/s		+12

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

23 December, tue

	763 mmHg		76%
	4.69 m/s		+12

23 December, Tuesday. day, 9°; night, 6°; overcast

24 December, wed

	763 mmHg		77%
	4.69 m/s		+12

24 December, Wednesday. day, 9°; night, 6°; overcast

25 December, thu

	762 mmHg		76%
	5.1 m/s		+12

25 December, Thursday. day, 9°; night, 6°; rain

26 December, fri

	762 mmHg		74%
	6.1 m/s		+12

26 December, Friday. day, 8°; night, 5°; rain

27 December, sat

	762 mmHg		73%
	5.9 m/s		+12

27 December, Saturday. day, 8°; night, 5°; rain

28 December, sun

	760 mmHg		75%
	5.7 m/s		+12

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

29 December, mon

	763 mmHg		75%
	4.69 m/s		+12

29 December, Monday. day, 7°; night, 5°; clear

30 December, tue

	764 mmHg		72%
	4.8 m/s		+12

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

31 December, wed

	764 mmHg		73%
	4.6 m/s		+12

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

1 January, thu

	763 mmHg		75%
	4.4 m/s		+11

1 January, Thursday. day, 8°; night, 5°; rain

2 January, fri

	762 mmHg		76%
	4.9 m/s		+11

2 January, Friday. day, 8°; night, 5°; rain

3 January, sat

	763 mmHg		72%
	5.4 m/s		+11

3 January, Saturday. day, 8°; night, 5°; rain

Average data for 10 years

Portoroz December

10

sunny days

12

days with precipitation

11

cloudy days

10 sunny days; 12 days with precipitation; 11 cloudy days;

74

%

air humidity

3.6

m/s

WindE

131

mm of precipitation

(10% of annual average)

+13

°C

Water temperature

air humidity 74%; 131 millimeters of precipitation (10% of annual average); Wind easterly 3.6 Meters per second; Water temperature +13°

Weather graphs for December

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

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

E

SE

SE

SE

SE

SE

SE

E

SE

E

E

E

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

Rome
Vienna
Venice
Munich
Florence
Ljubljana
Rimini
Bologna
Zagreb

Cities with similar weather in December

Istanbul
Thessaloniki
Tivat
Gudauta
Kobuleti
Herceg Novi
Marseilles
Dubrovnik
Gali

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

In December, the weather in Portoroz is typically cold. Average daily high temperature in December is about 9 degrees above zero. On average, Portoroz has 12 rainy, 10 sunny, 5 partly cloudy, and 4 cloudy days in December. The rains are usually heavy. December as well as January, February, March, and November is considered the most uncomfortable time to visit Portoroz.

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