Portorož
September
Weather in Portorož for September 2025
Your guide to Portorož weather in September - trends and predictions
Moderate Thunderstorm Risk Warning - See hour by hour.
Until now, September 2025 in Portorož is slightly cooler than the historical average by -0.8 °C.
Expect cooler weather in the next days in Portorož with the forecast suggesting a temperature of 23.2 °C, lower than the historical average.
In general, the average temperature in Portorož at the beginning of September is 28 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.1 °C by the end of September.
The climate of Portorož in September is notably wet, with an average of 13 rainy days, and a total of 157.8 mm of precipitation.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
17
Dry days
13
Rainy days
0
Snow days
23°/14°
Temperatures
15 km/h
Avg max wind
70 %
Avg humidity
Portorož Weather September
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Temperatures trend during September in Portorož
See the weather trend as well as the moving average line
September weather in Portorož day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Partly cloudy | 30° /19° | 0.2 mm | 8 | |
| 2 Sept. |  Sunny | 28° /19° | 5.6 mm | 7 | |
| 3 Sept. |  Patchy rain possible | 28° /18° | 1 mm | 6 | |
| 4 Sept. | Patchy rain possible | 29° /18° | 0.2 mm | 7 | |
| 5 Sept. | Patchy rain possible | 29° /18° | 3.9 mm | 7 | |
| 6 Sept. |  Patchy light rain with thunder | 26° /17° | 3.8 mm | 6 | |
| 7 Sept. | Sunny | 26° /16° | 0 mm | 7 | |
| 8 Sept. | Light rain shower | 26° /16° | 4.1 mm | 6 | |
| 9 Sept. | Light rain shower | 23° /16° | 14.5 mm | 5 | |
| 10 Sept. | Patchy rain possible | 23° /16° | 26.1 mm | 6 | |
| 11 Sept. | Partly cloudy | 24° /15° | 8.1 mm | 6 | |
| 12 Sept. |  Moderate or heavy rain shower | 22° /12° | 27.8 mm | 5 | |
| 13 Sept. | Patchy rain possible | 21° /12° | 0.5 mm | 5 | |
| 14 Sept. |  Patchy light drizzle | 19° /11° | 8 mm | 5 | |
| 15 Sept. | Patchy rain possible | 18° /11° | 0 mm | 4 | |
| 16 Sept. |  Moderate rain | 24° /14° | 16.1 mm | 1.1 | |
| 17 Sept. | Patchy rain possible | 23° /13° | 1.2 mm | 1.3 | |
| 18 Sept. | Sunny | 25° /13° | 0 mm | 1.3 | |
| 19 Sept. | Sunny | 28° /16° | 0 mm | 1.5 | |
| 20 Sept. | Sunny | 27° /18° | 0 mm | 6 | |
| 21 Sept. | Sunny | 26° /18° | 0 mm | 6 | |
| 22 Sept. | Sunny | 27° /17° | 0 mm | 6 | |
| 23 Sept. | Patchy rain possible | 24° /18° | 0.2 mm | 4 | |
| 24 Sept. | Patchy rain possible | 23° /16° | 3.4 mm | 4 | |
| 25 Sept. | Sunny | 22° /13° | 0.1 mm | 5 | |
| 26 Sept. | Partly cloudy | 20° /12° | 0 mm | 5 | |
| 27 Sept. | Partly cloudy | 15° /11° | 0 mm | 4 | |
| 28 Sept. | Patchy rain possible | 17° /10° | 0.1 mm | 3 | |
| 29 Sept. | Patchy rain possible | 19° /10° | 0.8 mm | 4 | |
| 30 Sept. | Partly cloudy | 18° /8° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Portorož in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Portorož forecast closer to your planned date for the most up-to-date weather information.
Change Month
Portorož in September - FAQ
What are the expected maximum and minimum temperatures in Portorož during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Portorož during September?
Significant rainfall exceeding 157.8 mm is expected in Portorož during September, occurring over more than 13 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Portorož during September?
The average wind speed in Portorož during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Portorož
Explore the daily rainfall trends and prepare for Portorožs September weather 💧
UV exposure in Portorož during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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