18.12
thu
thu
Day
54°F
N 2 mph
Precip.
83%
83%
Night
46°F
NE 2 mph
Precip.
72%
72%
19.12
fri
fri
Day
52°F
N 1 mph
Precip.
75%
75%
Night
46°F
SE 1 mph
Precip.
60%
60%
20.12
sat
sat
Day
55°F
S 2 mph
Precip.
0%
0%
Night
41°F
W 5 mph
Precip.
0%
0%
21.12
sun
sun
Day
54°F
SW 4 mph
Precip.
0%
0%
Night
45°F
W 3 mph
Precip.
0%
0%
22.12
mon
mon
Day
54°F
NW 4 mph
Precip.
100%
100%
Night
46°F
W 3 mph
Precip.
100%
100%
23.12
tue
tue
Day
54°F
W 2 mph
Precip.
100%
100%
Night
45°F
SW 5 mph
Precip.
100%
100%
24.12
wed
wed
Day
50°F
N 2 mph
Precip.
100%
100%
Night
43°F
W 2 mph
Precip.
24%
24%
25.12
thu
thu
Day
54°F
W 2 mph
Precip.
43%
43%
Night
46°F
W 5 mph
Precip.
71%
71%
26.12
fri
fri
Day
52°F
W 5 mph
Precip.
69%
69%
Night
46°F
W 8 mph
Precip.
75%
75%
27.12
sat
sat
Day
52°F
SW 9 mph
Precip.
21%
21%
Night
39°F
W 9 mph
Precip.
0%
0%
28.12
sun
sun
Day
46°F
SW 12 mph
Precip.
0%
0%
Night
34°F
W 6 mph
Precip.
0%
0%
29.12
mon
mon
Day
46°F
SW 4 mph
Precip.
0%
0%
Night
34°F
W 5 mph
Precip.
0%
0%
30.12
tue
tue
Day
46°F
SW 6 mph
Precip.
0%
0%
Night
34°F
SW 13 mph
Precip.
0%
0%
31.12
wed
wed
Day
39°F
SW 17 mph
Precip.
0%
0%
Night
32°F
SW 11 mph
Precip.
0%
0%
sea water
temperature
temperature
| Portoroz |
monthly
weather
weather
| Portoroz |
current
weather
weather
| Portoroz |
7 days
forecast
forecast
| Portoroz |
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.
Sea water temperature in January, °F
Show year:
2025
2024
2023
The average sea water temperature in January of 2025 was 51.6°F. The highest and lowest sea temperatures during the month were 53.2°F and 50.4°F.
Air temperature in Portoroz, °F
Precipitation total in Portoroz, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Portoroz
Portoroz on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Portoroz
Local time: 10:29
December 18, thursday
1200
54°F
N
2 mph
2 mph
1500
54°F
E
2 mph
2 mph
1800
52°F
N
2 mph
2 mph
2100
46°F
N
1 mph
1 mph
December 19, friday
0000
46°F
NE
2 mph
2 mph
0300
46°F
N
2 mph
2 mph
0600
46°F
N
2 mph
2 mph
0900
46°F
NE
1 mph
1 mph
