21.09
mon
mon
Day
79°F
SW 3 mph
Precip.
11%
11%
Night
61°F
W 8 mph
Precip.
11%
11%
22.09
tue
tue
Day
68°F
SW 7 mph
Precip.
9%
9%
Night
55°F
W 7 mph
Precip.
4%
4%
23.09
wed
wed
Day
68°F
S 2 mph
Precip.
1%
1%
Night
55°F
W 4 mph
Precip.
10%
10%
24.09
thu
thu
Day
70°F
SE 2 mph
Precip.
6%
6%
Night
57°F
W 3 mph
Precip.
9%
9%
25.09
fri
fri
Day
59°F
SW 12 mph
Precip.
29%
29%
Night
57°F
W 6 mph
Precip.
11%
11%
26.09
sat
sat
Day
64°F
W 3 mph
Precip.
11%
11%
Night
59°F
W 4 mph
Precip.
8%
8%
27.09
sun
sun
Day
73°F
W 3 mph
Precip.
2%
2%
Night
61°F
W 4 mph
Precip.
9%
9%
28.09
mon
mon
Day
73°F
NW 3 mph
Precip.
10%
10%
Night
63°F
W 4 mph
Precip.
19%
19%
29.09
tue
tue
Day
75°F
NW 3 mph
Precip.
11%
11%
Night
61°F
W 5 mph
Precip.
39%
39%
30.09
wed
wed
Day
73°F
N 3 mph
Precip.
9%
9%
Night
61°F
W 6 mph
Precip.
23%
23%
01.10
thu
thu
Day
63°F
NW 6 mph
Precip.
58%
58%
Night
61°F
NW 4 mph
Precip.
30%
30%
02.10
fri
fri
Day
72°F
E 3 mph
Precip.
7%
7%
Night
63°F
W 3 mph
Precip.
14%
14%
03.10
sat
sat
Day
75°F
SE 3 mph
Precip.
3%
3%
Night
66°F
W 4 mph
Precip.
19%
19%
04.10
sun
sun
Day
79°F
NW 3 mph
Precip.
3%
3%
Night
68°F
W 4 mph
Precip.
7%
7%
sea water
temperature
temperature
| Portoroz |
monthly
weather
weather
| Portoroz |
current
weather
weather
| Portoroz |
7 days
forecast
forecast
| Portoroz |
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 78.7°F. The highest and lowest sea temperatures during the month were 81.5°F and 75.7°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 67.1°F. The highest and lowest sea temperatures during the month were 72.7°F and 63.0°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: 13:57
September 21, monday
1500
77°F
SW
7 mph
7 mph
1800
72°F
SW
5 mph
5 mph
2100
63°F
SW
8 mph
8 mph
September 22, tuesday
0000
61°F
W
8 mph
8 mph
0300
57°F
W
7 mph
7 mph
0600
54°F
W
7 mph
7 mph
0900
57°F
W
7 mph
7 mph
1200
68°F
SW
7 mph
7 mph
