Portorož Weather in September
What's the weather like in Portorož (Piran-Pirano) in September 2025?
The climate in Portorož during September can be summarized as warm and damp.
September is in the fall / autumn in Portorož and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 14°C (57°F) is normal.
| Daytime temperature | 23.6°C 74.5°F |
|---|---|
| Nightly temperature | 13.9°C 56.9°F |
| Average temperature | 18.7°C 65.7°F |
| Daily sunshine | 7.6 hrs |
| Avg rainfall | 115 mm 4.5 ins |
| Rainy days | 11 days |
| Sea temperature | 23°C 73.4°F |
| Humidity | 72% |
| Windspeed | 6.6kph 4 mph |
On average September is the 2nd wettest month of the year in Portorož with around 115mm 4.5 inches of rain making it a damp time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.6 hours of sunshine per day.
September temperatures in Portorož
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Portorož in September 2025.
Other monthly averages
Best places to visit in September
Portorož weather stats
| Hottest month: | July | 27.4°C 81.3°F |
|---|---|---|
| Driest month: | February | 77mm 3ins |
| Sunniest month: | July | 10.1hrs |
| Coldest month: | January | 7.3°C 45.1°F |
| Wettest month: | November | 123mm 4.8ins |
© Google