Slovenia (Ljubljana)
September
Weather in Slovenia for September 2025
Your guide to Slovenia weather in September - trends and predictions
In general, the average temperature in Slovenia at the beginning of September is 26 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.1 °C by the end of September.
Slovenia in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 90.6 mm.
Is September a good time to visit Slovenia? check out the best time to travel to Slovenia page.
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Temperatures
Rain 🌧️
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13
Dry days
17
Rainy days
0
Snow days
21°/10°
Temperatures
10 km/h
Avg max wind
79 %
Avg humidity
Slovenia in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2 28° | 3 27° | 4  25° | 5  25° | 6 24° | 7 25° |
| 8 26° | 9 22° | 10 24° | 11 25° | 12  21° | 13 17° | 14 18° |
| 15 18° | 16 20° | 17 18° | 18 21° | 19  18° | 20 18° | 21 21° |
| 22 21° | 23 19° | 24  17° | 25 18° | 26 21° | 27 21° | 28 20° |
| 29 19° | 30  18° |
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Temperatures trend during September in Slovenia
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. | Mist | 28° /13° | 0 mm | 7 | |
| 2 Sept. | Mist | 28° /14° | 0 mm | 7 | |
| 3 Sept. | Mist | 27° /13° | 4.2 mm | 6 | |
| 4 Sept. | Overcast | 25° /12° | 0.4 mm | 6 | |
| 5 Sept. | Sunny | 25° /12° | 3.7 mm | 6 | |
| 6 Sept. | Sunny | 24° /11° | 2.3 mm | 6 | |
| 7 Sept. | Sunny | 25° /12° | 0 mm | 6 | |
| 8 Sept. | Sunny | 26° /12° | 0.2 mm | 7 | |
| 9 Sept. | Sunny | 22° /12° | 5.6 mm | 6 | |
| 10 Sept. | Sunny | 24° /11° | 0.2 mm | 6 | |
| 11 Sept. | Sunny | 25° /11° | 0.2 mm | 6 | |
| 12 Sept. | Partly cloudy | 21° /9° | 31.9 mm | 6 | |
| 13 Sept. | Partly cloudy | 17° /8° | 5.5 mm | 5 | |
| 14 Sept. | Mist | 18° /9° | 3.7 mm | 4 | |
| 15 Sept. | Fog | 18° /8° | 0.2 mm | 5 | |
| 16 Sept. | Mist | 20° /8° | 1.5 mm | 5 | |
| 17 Sept. | Mist | 18° /8° | 1.7 mm | 4 | |
| 18 Sept. | Mist | 21° /9° | 0.1 mm | 5 | |
| 19 Sept. | Light rain shower | 18° /10° | 3.6 mm | 5 | |
| 20 Sept. | Light rain shower | 18° /10° | 1.5 mm | 4 | |
| 21 Sept. | Patchy rain possible | 21° /10° | 0.3 mm | 5 | |
| 22 Sept. | Light rain shower | 21° /10° | 6.9 mm | 5 | |
| 23 Sept. | Light rain shower | 19° /9° | 3.7 mm | 5 | |
| 24 Sept. | Light drizzle | 17° /11° | 5.2 mm | 4 | |
| 25 Sept. | Patchy rain possible | 18° /9° | 1.4 mm | 4 | |
| 26 Sept. | Fog | 21° /9° | 0.1 mm | 5 | |
| 27 Sept. | Partly cloudy | 21° /12° | 2.6 mm | 5 | |
| 28 Sept. | Sunny | 20° /8° | 3.5 mm | 5 | |
| 29 Sept. | Sunny | 19° /7° | 0.2 mm | 5 | |
| 30 Sept. | Cloudy | 18° /6° | 0 mm | 4 | |
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Important Notice
Our weather forecast for Slovenia 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 Slovenia forecast closer to your planned date for the most up-to-date weather information.
Slovenia in September - FAQ
What are the expected maximum and minimum temperatures in Slovenia during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Slovenia during September?
Moderate rainfall is anticipated in Slovenia during September, with a total of 90.6 mm spread over approximately 17 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Slovenia during September?
The average wind speed in Slovenia during September is 10 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Slovenia in September?
As you prepare for your trip to Slovenia 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 Slovenia, 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 Slovenia
Explore the daily rainfall trends and prepare for Slovenias September weather 💧
UV exposure in Slovenia during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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