Koper-Capodistria (Koper)
September
Weather in Koper-Capodistria for September 2025
Your guide to Koper-Capodistria weather in September - trends and predictions
In general, the average temperature in Koper-Capodistria at the beginning of September is 29.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.9 °C by the end of September.
The climate of Koper-Capodistria in September is notably wet, with an average of 13 rainy days, and a total of 157.8 mm of precipitation.
Is September a good time to visit Koper-Capodistria? check out the best time to travel to Koper-Capodistria page.
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Temperatures
Rain 🌧️
More
17
Dry days
13
Rainy days
0
Snow days
23°/14°
Temperatures
15 km/h
Avg max wind
70 %
Avg humidity
Koper-Capodistria in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  34° | 2  32° | 3  29° | 4 29° | 5 30° | 6  25° | 7 27° |
| 8 27° | 9 22° | 10 26° | 11 25° | 12  19° | 13 16° | 14  16° |
| 15 18° | 16  20° | 17 17° | 18 22° | 19 22° | 20 22° | 21 24° |
| 22 24° | 23 23° | 24 20° | 25 20° | 26 20° | 27 22° | 28 20° |
| 29 19° | 30 18° |
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Temperatures trend during September in Koper-Capodistria
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Partly cloudy | 34° /22° | 0 mm | 8 | |
| 2 Sept. | Sunny | 32° /22° | 0 mm | 8 | |
| 3 Sept. | Patchy rain possible | 29° /20° | 0.2 mm | 6 | |
| 4 Sept. | Patchy rain possible | 29° /19° | 0.4 mm | 6 | |
| 5 Sept. | Patchy rain possible | 30° /19° | 7.1 mm | 7 | |
| 6 Sept. | Patchy light rain with thunder | 25° /18° | 7.6 mm | 6 | |
| 7 Sept. | Sunny | 27° /17° | 0 mm | 7 | |
| 8 Sept. | Light rain shower | 27° /18° | 8.1 mm | 6 | |
| 9 Sept. | Light rain shower | 22° /15° | 26.1 mm | 5 | |
| 10 Sept. | Patchy rain possible | 26° /15° | 0.4 mm | 6 | |
| 11 Sept. | Partly cloudy | 25° /16° | 0.1 mm | 7 | |
| 12 Sept. | Moderate or heavy rain shower | 19° /10° | 52.2 mm | 4 | |
| 13 Sept. | Patchy rain possible | 16° /10° | 1 mm | 4 | |
| 14 Sept. | Patchy light drizzle | 16° /9° | 7.1 mm | 4 | |
| 15 Sept. | Patchy rain possible | 18° /11° | 0 mm | 4 | |
| 16 Sept. | Cloudy | 20° /10° | 0.3 mm | 5 | |
| 17 Sept. | Patchy rain possible | 17° /12° | 0.1 mm | 4 | |
| 18 Sept. | Partly cloudy | 22° /14° | 0 mm | 6 | |
| 19 Sept. | Cloudy | 22° /17° | 0 mm | 5 | |
| 20 Sept. | Partly cloudy | 22° /15° | 0 mm | 6 | |
| 21 Sept. | Sunny | 24° /13° | 0 mm | 6 | |
| 22 Sept. | Sunny | 24° /12° | 0 mm | 6 | |
| 23 Sept. | Light rain shower | 23° /13° | 3.5 mm | 5 | |
| 24 Sept. | Patchy light rain with thunder | 20° /14° | 21.5 mm | 5 | |
| 25 Sept. | Patchy light rain with thunder | 20° /12° | 11.1 mm | 5 | |
| 26 Sept. | Light rain shower | 20° /15° | 1 mm | 5 | |
| 27 Sept. | Light rain shower | 22° /16° | 6.7 mm | 5 | |
| 28 Sept. | Patchy rain possible | 20° /11° | 2.7 mm | 5 | |
| 29 Sept. | Patchy rain possible | 19° /10° | 0.8 mm | 4 | |
| 30 Sept. | Partly cloudy | 18° /8° | 0 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.
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 157.8 mm is expected in Koper-Capodistria during September, occurring over more than 13 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 15 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Koper-Capodistria in September?
As you prepare for your trip to Koper-Capodistria in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Koper-Capodistria, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Koper-Capodistria
Explore the daily rainfall trends and prepare for Koper-Capodistrias September weather 💧
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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