Portoroz Weather: September
 |
Average Day Temperature: | 77.9°F |
|
Average Night Temperature: | 61.0°F |
|
Sea Water Temperature: | 77.1°F |
|
Number of Sunny Days: | 18 days |
| Sunshine Hours: | 11.8 - 13.3 hours | |
|
Number of Rainy Days: | 6 days |
| Precipitation Totals: | 3.9 in | |
| detailed information | ||
forecast
| Portoroz |
Temperature
| Portoroz |
Air Temperature in September, °F
The highest day temperature in September 2026 was 92°F. The lowest night temperature was 53°F. The average values for day and night temperatures during September were 79.8°F и 62.5°F respectivly.
Portoroz Water Sea Temperature in September, °F
The average sea surface temperature in September 2026 for Portoroz was 80.7°F. The maximum and minimum values were 77.0°F and 85.0°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Portoroz is 3.9 in. It makes september one of the most rainy months of the year.
The average wind speed in September is 5.6 mph. This value is relatively stable throughout the year.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Portoroz in September is 8.7 hours.
Portoroz on the Weather Map
| Bled |  |
+60 |
| Bohinjsko Jezero | |
+60 |
| Cerkno |  |
+60 |
| Dolenjske Toplice | |
+66 |
| Isola |  |
+72 |
| Koper | |
+72 |
| Kranjska Gora | |
+60 |
| Ljubljana |  |
+68 |
| Maribor | |
+66 |
| Moravske Toplice | |
+66 |
| Piran | |
+72 |
| Portoroz | |
+72 |
| Rogaska Slatina | |
+68 |
| Smarjeske Toplice | |
+66 |
| Strunjan | |
+72 |
| 1500 |  |
72°F | SE 5 mph |
| 1800 |  |
60°F | SE 2 mph |
| 2100 |  |
56°F | W 4 mph |
| 0000 |  |
54°F | NW 4 mph |
| 0300 |  |
54°F | NW 4 mph |
| 0600 | |
52°F | NW 4 mph |
| 0900 | |
58°F | W 4 mph |
| 1200 |  |
70°F | N 10 mph |