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September 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

31 August, sun

	760 mmHg		68%
	5.3 m/s		+25

31 August, Sunday. day, 24°; night, 19°; rain

1 September, mon

	760 mmHg		69%
	5 m/s		+25

1 September, Monday. day, 23°; night, 19°; rain

2 September, tue

	761 mmHg		68%
	4.69 m/s		+25

2 September, Tuesday. day, 24°; night, 19°; clear

3 September, wed

	761 mmHg		70%
	4.9 m/s		+25

3 September, Wednesday. day, 24°; night, 19°; overcast

4 September, thu

	761 mmHg		71%
	5 m/s		+25

4 September, Thursday. day, 24°; night, 19°; partly cloudy

5 September, fri

	760 mmHg		69%
	5.4 m/s		+24

5 September, Friday. day, 23°; night, 19°; clear

6 September, sat

	761 mmHg		66%
	4.69 m/s		+24

6 September, Saturday. day, 23°; night, 19°; clear

7 September, sun

	761 mmHg		69%
	4.69 m/s		+25

7 September, Sunday. day, 23°; night, 19°; clear

8 September, mon

	761 mmHg		71%
	5.3 m/s		+24

8 September, Monday. day, 23°; night, 19°; clear

9 September, tue

	760 mmHg		70%
	5 m/s		+24

9 September, Tuesday. day, 23°; night, 18°; clear

10 September, wed

	761 mmHg		70%
	4.9 m/s		+24

10 September, Wednesday. day, 23°; night, 19°; clear

11 September, thu

	760 mmHg		70%
	4.9 m/s		+24

11 September, Thursday. day, 23°; night, 19°; clear

12 September, fri

	760 mmHg		72%
	4.9 m/s		+24

12 September, Friday. day, 23°; night, 18°; clear

13 September, sat

	760 mmHg		71%
	5.3 m/s		+23

13 September, Saturday. day, 22°; night, 18°; partly cloudy

14 September, sun

	760 mmHg		72%
	5.6 m/s		+23

14 September, Sunday. day, 22°; night, 18°; rain

15 September, mon

	760 mmHg		72%
	5.4 m/s		+23

15 September, Monday. day, 22°; night, 18°; partly cloudy

16 September, tue

	759 mmHg		73%
	5.1 m/s		+23

16 September, Tuesday. day, 22°; night, 18°; rain

17 September, wed

	759 mmHg		73%
	5.8 m/s		+23

17 September, Wednesday. day, 21°; night, 18°; rain

18 September, thu

	760 mmHg		73%
	5.4 m/s		+22

18 September, Thursday. day, 21°; night, 17°; rain

19 September, fri

	760 mmHg		72%
	5.7 m/s		+23

19 September, Friday. day, 21°; night, 17°; rain

20 September, sat

	761 mmHg		68%
	5.3 m/s		+22

20 September, Saturday. day, 21°; night, 17°; clear

21 September, sun

	762 mmHg		68%
	5.1 m/s		+22

21 September, Sunday. day, 21°; night, 17°; clear

22 September, mon

	761 mmHg		69%
	4.8 m/s		+22

22 September, Monday. day, 21°; night, 16°; partly cloudy

23 September, tue

	761 mmHg		72%
	4.8 m/s		+22

23 September, Tuesday. day, 20°; night, 16°; rain

24 September, wed

	760 mmHg		73%
	5.5 m/s		+22

24 September, Wednesday. day, 20°; night, 16°; rain

25 September, thu

	760 mmHg		72%
	5 m/s		+21

25 September, Thursday. day, 20°; night, 16°; rain

26 September, fri

	761 mmHg		70%
	5.2 m/s		+21

26 September, Friday. day, 20°; night, 16°; clear

27 September, sat

	761 mmHg		71%
	5 m/s		+21

27 September, Saturday. day, 20°; night, 16°; partly cloudy

28 September, sun

	762 mmHg		73%
	4.5 m/s		+21

28 September, Sunday. day, 20°; night, 16°; rain

29 September, mon

	762 mmHg		71%
	4.8 m/s		+21

29 September, Monday. day, 20°; night, 16°; clear

30 September, tue

	762 mmHg		71%
	5 m/s		+21

30 September, Tuesday. day, 19°; night, 16°; partly cloudy

1 October, wed

	761 mmHg		75%
	4.9 m/s		+21

1 October, Wednesday. day, 19°; night, 16°; rain

2 October, thu

	761 mmHg		76%
	4.9 m/s		+21

2 October, Thursday. day, 19°; night, 16°; rain

3 October, fri

	761 mmHg		75%
	5.8 m/s		+20

3 October, Friday. day, 19°; night, 16°; rain

4 October, sat

	762 mmHg		75%
	5.6 m/s		+20

4 October, Saturday. day, 19°; night, 15°; rain

Average data for 10 years

Portoroz September

13

sunny days

10

days with precipitation

5

cloudy days

13 sunny days; 10 days with precipitation; 5 cloudy days;

71

%

air humidity

3.2

m/s

WindE

174

mm of precipitation

(12% of annual average)

+23

°C

Water temperature

air humidity 71%; 174 millimeters of precipitation (12% of annual average); Wind easterly 3.2 Meters per second; Water temperature +23°

Weather graphs for September

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

SE

E

E

SE

E

E

E

E

E

E

E

SE

SE

SE

SE

SE

SE

SE

E

E

E

E

SE

SE

E

E

SE

E

E

SE

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

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27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Rome
Vienna
Venice
Munich
Florence
Ljubljana
Rimini
Bologna
Zagreb

Cities with similar weather in September

Gagra
Istanbul
Pitsunda
New York
Tivat
Herceg Novi
Split
Cannes
Sozopol

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

In September, the weather in Portoroz is typically warm. Average daily high temperature in September is about 22 degrees above zero. On average, Portoroz has 13 sunny, 10 rainy, 6 partly cloudy, and 1 cloudy day in September. The rains are usually heavy.

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