29.12
mon
mon
Day
48°F
SE 2 mph
Precip.
0%
0%
Night
34°F
NW 3 mph
Precip.
0%
0%
30.12
tue
tue
Day
46°F
SW 12 mph
Precip.
0%
0%
Night
28°F
SW 9 mph
Precip.
0%
0%
31.12
wed
wed
Day
37°F
SE 4 mph
Precip.
0%
0%
Night
28°F
W 1 mph
Precip.
0%
0%
01.01
thu
thu
Day
39°F
N 2 mph
Precip.
0%
0%
Night
30°F
S 1 mph
Precip.
85%
85%
02.01
fri
fri
Day
39°F
N 2 mph
Precip.
100%
100%
Night
37°F
NE 1 mph
Precip.
100%
100%
03.01
sat
sat
Day
52°F
N 9 mph
Precip.
100%
100%
Night
52°F
N 19 mph
Precip.
100%
100%
04.01
sun
sun
Day
55°F
N 19 mph
Precip.
100%
100%
Night
48°F
N 11 mph
Precip.
100%
100%
05.01
mon
mon
Day
37°F
SW 15 mph
Precip.
100%
100%
Night
28°F
SW 13 mph
Precip.
100%
100%
06.01
tue
tue
Day
34°F
SW 9 mph
Precip.
0%
0%
Night
25°F
SW 4 mph
Precip.
0%
0%
07.01
wed
wed
Day
41°F
NE 2 mph
Precip.
0%
0%
Night
32°F
W 6 mph
Precip.
0%
0%
08.01
thu
thu
Day
43°F
SW 6 mph
Precip.
0%
0%
Night
30°F
W 6 mph
Precip.
0%
0%
09.01
fri
fri
Day
43°F
W 2 mph
Precip.
0%
0%
Night
39°F
W 4 mph
Precip.
100%
100%
10.01
sat
sat
Day
48°F
W 4 mph
Precip.
22%
22%
Night
43°F
N 2 mph
Precip.
56%
56%
11.01
sun
sun
Day
46°F
NW 2 mph
Precip.
100%
100%
Night
43°F
NE 2 mph
Precip.
72%
72%
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 56.3°F. The highest and lowest sea temperatures during the month were 57.9°F and 55.0°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: 18:01
December 29, monday
2100
36°F
NW
2 mph
2 mph
December 30, tuesday
0000
34°F
NW
3 mph
3 mph
0300
34°F
NW
4 mph
4 mph
0600
34°F
W
5 mph
5 mph
0900
36°F
W
5 mph
5 mph
1200
46°F
SW
12 mph
12 mph
1500
43°F
W
14 mph
14 mph
1800
37°F
W
19 mph
19 mph
