Piran-Pirano (Portorož)
September
Weather in Piran-Pirano for September 2025
Your guide to Piran-Pirano weather in September - trends and predictions
Until now, September 2025 in Piran-Pirano has been nearly identical to the historical average, with a temperature of 24.4 °C (showing only a slight deviation of -0.4 °C).
The forecast for the next days in Piran-Pirano predicts temperatures to be around 23 °C, close to the historical average.
In general, the average temperature in Piran-Pirano at the beginning of September is 28 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.9 °C by the end of September.
The climate of Piran-Pirano in September is notably wet, with an average of 13 rainy days, and a total of 157.8 mm of precipitation.
Temperatures
Rain 🌧️
17
Dry days
13
Rainy days
0
Snow days
23°/14°
Temperatures
15 km/h
Avg max wind
70 %
Avg humidity
Piran-Pirano Weather September
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Temperatures trend during September in Piran-Pirano
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September weather in Piran-Pirano 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 | 21° /12° | 0 mm | 5 | |
| 16 Sept. |  Cloudy | 22° /11° | 8.1 mm | 5 | |
| 17 Sept. | Patchy rain possible | 17° /12° | 0.1 mm | 4 | |
| 18 Sept. | Sunny | 25° /14° | 0 mm | 1.4 | |
| 19 Sept. | Sunny | 28° /16° | 0 mm | 1.4 | |
| 20 Sept. | Sunny | 28° /18° | 0 mm | 1.3 | |
| 21 Sept. | Sunny | 26° /17° | 0 mm | 1.6 | |
| 22 Sept. | Sunny | 27° /18° | 0.1 mm | 5 | |
| 23 Sept. | Patchy rain possible | 22° /17° | 1.7 mm | 4 | |
| 24 Sept. | Sunny | 23° /16° | 0 mm | 5 | |
| 25 Sept. | Sunny | 24° /14° | 0.1 mm | 5 | |
| 26 Sept. | Sunny | 23° /12° | 0 mm | 5 | |
| 27 Sept. | Patchy rain possible | 23° /13° | 3.3 mm | 4 | |
| 28 Sept. | Patchy rain possible | 15° /9° | 0.2 mm | 3 | |
| 29 Sept. | Partly cloudy | 19° /10° | 0 mm | 4 | |
| 30 Sept. | Partly cloudy | 19° /13° | 0 mm | 4 | |
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Important Notice
Our weather forecast for Piran-Pirano 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 Piran-Pirano forecast closer to your planned date for the most up-to-date weather information.
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Piran-Pirano in September - FAQ
What are the expected maximum and minimum temperatures in Piran-Pirano 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 Piran-Pirano during September?
Significant rainfall exceeding 157.8 mm is expected in Piran-Pirano during September, occurring over more than 13 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Piran-Pirano during September?
The average wind speed in Piran-Pirano during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Piran-Pirano
Explore the daily rainfall trends and prepare for Piran-Piranos September weather 💧
UV exposure in Piran-Pirano during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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