01.09
tue
tue
Day
84°F
SW 4 mph
Precip.
2%
2%
Night
70°F
W 6 mph
Precip.
4%
4%
02.09
wed
wed
Day
84°F
SW 3 mph
Precip.
1%
1%
Night
70°F
W 6 mph
Precip.
4%
4%
03.09
thu
thu
Day
86°F
SW 6 mph
Precip.
1%
1%
Night
70°F
W 4 mph
Precip.
3%
3%
04.09
fri
fri
Day
86°F
E 4 mph
Precip.
1%
1%
Night
70°F
W 3 mph
Precip.
3%
3%
05.09
sat
sat
Day
88°F
E 5 mph
Precip.
1%
1%
Night
72°F
W 4 mph
Precip.
3%
3%
06.09
sun
sun
Day
84°F
SW 8 mph
Precip.
1%
1%
Night
68°F
W 6 mph
Precip.
4%
4%
07.09
mon
mon
Day
84°F
NW 3 mph
Precip.
1%
1%
Night
72°F
W 4 mph
Precip.
13%
13%
08.09
tue
tue
Day
86°F
SE 4 mph
Precip.
5%
5%
Night
72°F
W 4 mph
Precip.
14%
14%
09.09
wed
wed
Day
86°F
E 4 mph
Precip.
1%
1%
Night
72°F
W 3 mph
Precip.
6%
6%
10.09
thu
thu
Day
84°F
NE 4 mph
Precip.
1%
1%
Night
70°F
W 5 mph
Precip.
8%
8%
11.09
fri
fri
Day
81°F
N 8 mph
Precip.
25%
25%
Night
70°F
SW 2 mph
Precip.
69%
69%
12.09
sat
sat
Day
75°F
SW 5 mph
Precip.
11%
11%
Night
63°F
W 5 mph
Precip.
22%
22%
13.09
sun
sun
Day
72°F
W 10 mph
Precip.
9%
9%
Night
64°F
SW 9 mph
Precip.
10%
10%
14.09
mon
mon
Day
72°F
SW 12 mph
Precip.
1%
1%
Night
64°F
W 9 mph
Precip.
9%
9%
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:
2025
2024
2023
The average sea water temperature in September of 2025 was 75.3°F. The highest and lowest sea temperatures during the month were 77.2°F and 73.0°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: 10:40
September 01, tuesday
1200
84°F
SW
4 mph
4 mph
1500
88°F
S
4 mph
4 mph
1800
82°F
S
5 mph
5 mph
2100
72°F
W
4 mph
4 mph
September 02, wednesday
0000
70°F
W
6 mph
6 mph
0300
68°F
W
6 mph
6 mph
0600
66°F
W
6 mph
6 mph
0900
73°F
W
5 mph
5 mph
