Koper-Capodistria (Koper)
September
Weather in Koper-Capodistria for September 2026
Your guide to Koper-Capodistria weather in September - trends and predictions
So far, September 2026 in Koper-Capodistria is slightly warmer than the historical average by 1.8 °C.
Expect cooler weather in the next days in Koper-Capodistria with the forecast suggesting a temperature of 24.6 °C, lower than the historical average.
In general, the average temperature in Koper-Capodistria at the beginning of September is 29.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.9 °C by the end of September.
Koper-Capodistria in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 156.7 mm.
Temperatures
Rain 🌧️
12
Dry days
18
Rainy days
0
Snow days
23°/14°
Temperatures
12 km/h
Avg max wind
72 %
Avg humidity
Koper-Capodistria Weather September
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Temperatures trend during September in Koper-Capodistria
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September weather in Koper-Capodistria day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Partly cloudy | 30° /19° | 0.1 mm | 7 | |
| 2 Sept. |  Sunny | 29° /18° | 3.7 mm | 7 | |
| 3 Sept. |  Patchy rain possible | 29° /18° | 0.7 mm | 6 | |
| 4 Sept. | Sunny | 30° /18° | 0.1 mm | 6 | |
| 5 Sept. | Patchy rain possible | 30° /19° | 2.6 mm | 7 | |
| 6 Sept. |  Patchy light rain with thunder | 28° /17° | 2.5 mm | 6 | |
| 7 Sept. | Sunny | 28° /16° | 0 mm | 6 | |
| 8 Sept. | Light rain shower | 28° /17° | 2.7 mm | 6 | |
| 9 Sept. | Light rain shower | 25° /16° | 14.5 mm | 4 | |
| 10 Sept. |  Moderate or heavy rain shower | 23° /15° | 40.5 mm | 4 | |
| 11 Sept. | Light rain shower | 23° /15° | 21.2 mm | 5 | |
| 12 Sept. | Sunny | 25° /13° | 0 mm | 5 | |
| 13 Sept. | Sunny | 25° /15° | 0 mm | 5.2 | |
| 14 Sept. |  Overcast | 27° /17° | 0 mm | 5.1 | |
| 15 Sept. | Sunny | 27° /16° | 0 mm | 7 | |
| 16 Sept. | Sunny | 26° /16° | 0 mm | 7 | |
| 17 Sept. | Sunny | 27° /17° | 0.4 mm | 7 | |
| 18 Sept. | Light rain shower | 19° /15° | 39.7 mm | 4 | |
| 19 Sept. | Patchy rain possible | 22° /14° | 5.8 mm | 5 | |
| 20 Sept. | Overcast | 23° /15° | 1.5 mm | 5 | |
| 21 Sept. | Overcast | 24° /15° | 0 mm | 6 | |
| 22 Sept. | Sunny | 25° /16° | 0 mm | 7 | |
| 23 Sept. | Sunny | 25° /15° | 0 mm | 6 | |
| 24 Sept. | Sunny | 26° /14° | 0 mm | 7 | |
| 25 Sept. | Patchy light rain with thunder | 20° /11° | 7.4 mm | 5 | |
| 26 Sept. | Light rain shower | 20° /13° | 1.1 mm | 5 | |
| 27 Sept. | Light rain shower | 22° /14° | 4.6 mm | 5 | |
| 28 Sept. | Patchy rain possible | 21° /11° | 1.5 mm | 5 | |
| 29 Sept. | Patchy rain possible | 20° /10° | 0.4 mm | 5 | |
| 30 Sept. | Partly cloudy | 17° /9° | 0.3 mm | 5 | |
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Important Notice
Our weather forecast for Koper-Capodistria 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 Koper-Capodistria forecast closer to your planned date for the most up-to-date weather information.
Change Month
Koper-Capodistria in September - FAQ
What are the expected maximum and minimum temperatures in Koper-Capodistria 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 Koper-Capodistria during September?
Significant rainfall exceeding 156.7 mm is expected in Koper-Capodistria during September, occurring over more than 18 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Koper-Capodistria during September?
The average wind speed in Koper-Capodistria during September is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Koper-Capodistria
Explore the daily rainfall trends and prepare for Koper-Capodistrias September weather 💧
Typically, Koper-Capodistria has 18 rainy days in September with a total of 156.7 mm of rainfall.
UV exposure in Koper-Capodistria during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is Koper-Capodistria?Get accurate weather forecasts for Koper-Capodistria, located at latitude 45.547 and longitude 13.729. Stay updated with localized weather information tailored for Koper-Capodistria.
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