World Resorts Slovenia Portoroz Weather

Portoroz Sea Temperature in December

Average sea water temperature in December:
+55.7°F
Minimum sea water temperature in December: 61.0°F
Maximum sea water temperature in December: 50.4°F

Daily sea water temperature in December, °F

Show year:
2025
2024
2023

The average sea water temperature in December of 2025 was 56.8°F. The highest and lowest sea temperatures during the month were 57.9°F and 55.4°F.

Monthly sea water temperature in Portoroz, °F

Which Slovenia resorts have warmest sea in December?

Place name December 2025 December 2024
Portoroz 56.8°F 56.5°F
Piran 56.8°F 56.5°F
Strunjan 56.5°F 56.2°F
Isola 56.3°F 55.9°F
Dolenjske Toplice 56.3°F 57.1°F
Koper 56.0°F 55.7°F
Cerkno 54.5°F 54.0°F
Bohinjsko Jezero 54.3°F 53.8°F

Best time for vacation in Portoroz

Sunniest months:
August 23 days
July 22 days
June 20 days
Warmest months:
August 85.0 °F
July 84.9 °F
June 80.3 °F
Warmest sea temp:
August 78.7 °F
July 78.4 °F
September 74.2 °F
Coldest months:
January 45.6 °F
December 47.7 °F
February 48.3 °F
Rainiest months:
May 7 days
November 6 days
September 6 days
Windiest months:
February 6.5 mph
March 6.4 mph
November 6.1 mph

Portoroz on a weather map

Current weather
17:39
Portoroz
+50°F
N 2 mph
Feels like: +50°F
Precip.: 0%
Places in Slovenia:
Name
°F
Bohinjsko Jezero
+41°F
Dolenjske Toplice
+41°F
Zrece
+45°F
Isola
+50°F
Koper
+50°F
Kranjska Gora
+41°F
Ljubljana
+46°F
Maribor
+45°F
Moravske Toplice
+43°F
Piran
+50°F
Portoroz
+50°F
Rogaska Slatina
+45°F
Strunjan
+50°F
Terme Radenci
+45°F
Cerkno
+48°F
all places
24 Hours Forecast
Portoroz
Local time: 17:39
December 18, thursday
1800
50°F
N
2 mph
2100
45°F
N
2 mph
December 19, friday
0000
45°F
N
2 mph
0300
45°F
N
2 mph
0600
45°F
N
2 mph
0900
46°F
N
2 mph
1200
52°F
N
1 mph
1500
54°F
NE
1 mph
Units of measurement: °C / °F