Slovenia (Ljubljana)
September
Weather in Slovenia for September 2026
Your guide to Slovenia weather in September - trends and predictions
So far, September 2026 in Slovenia is slightly warmer than the historical average by 0.8 °C.
The forecast for the next days in Slovenia predicts a temperature of 20 °C, which is cooler than the historical average.
In general, the average temperature in Slovenia at the beginning of September is 25.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.3 °C by the end of September.
Slovenia experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 116.7 mm.
Temperatures
Rain 🌧️
9
Dry days
21
Rainy days
0
Snow days
21°/10°
Temperatures
9 km/h
Avg max wind
81 %
Avg humidity
Slovenia Weather September
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What’s the Weather Like in Slovenia This September?
Discover the average temperatures and weather trends across Slovenia’s cities this September.
Temperatures trend during September in Slovenia
See the weather trend as well as the moving average line
September weather in Slovenia day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 26° /13° | 0 mm | 6 | |
| 2 Sept. |  Patchy rain possible | 26° /14° | 0.5 mm | 5 | |
| 3 Sept. |  Mist | 26° /13° | 2.2 mm | 6 | |
| 4 Sept. |  Overcast | 26° /13° | 0.2 mm | 6 | |
| 5 Sept. | Sunny | 26° /13° | 3.3 mm | 6 | |
| 6 Sept. | Sunny | 23° /12° | 1.2 mm | 6 | |
| 7 Sept. | Sunny | 25° /12° | 0 mm | 6 | |
| 8 Sept. | Sunny | 27° /13° | 0.1 mm | 6 | |
| 9 Sept. | Sunny | 23° /13° | 5 mm | 5 | |
| 10 Sept. | Sunny | 21° /11° | 39.7 mm | 4 | |
| 11 Sept. | Patchy rain possible | 14° /12° | 19.3 mm | 1.9 | |
| 12 Sept. | Sunny | 21° /10° | 0 mm | 5.1 | |
| 13 Sept. | Sunny | 22° /11° | 0 mm | 5.2 | |
| 14 Sept. | Sunny | 21° /14° | 0.7 mm | 5 | |
| 15 Sept. | Sunny | 23° /12° | 0 mm | 6 | |
| 16 Sept. | Sunny | 23° /13° | 0 mm | 6 | |
| 17 Sept. | Sunny | 22° /13° | 0.4 mm | 6 | |
| 18 Sept. | Light rain shower | 16° /13° | 25.3 mm | 3 | |
| 19 Sept. | Fog | 19° /11° | 3.5 mm | 5 | |
| 20 Sept. | Fog | 20° /13° | 0.1 mm | 4 | |
| 21 Sept. | Overcast | 19° /12° | 0 mm | 4 | |
| 22 Sept. | Sunny | 22° /13° | 0 mm | 6 | |
| 23 Sept. |  Cloudy | 18° /11° | 0 mm | 5 | |
| 24 Sept. | Sunny | 20° /10° | 0 mm | 6 | |
| 25 Sept. | Light rain shower | 18° /9° | 3 mm | 4 | |
| 26 Sept. | Fog | 19° /9° | 1 mm | 4 | |
| 27 Sept. |  Partly cloudy | 19° /10° | 1.7 mm | 5 | |
| 28 Sept. | Sunny | 19° /7° | 2.3 mm | 5 | |
| 29 Sept. | Sunny | 18° /7° | 0.2 mm | 5 | |
| 30 Sept. | Cloudy | 15° /6° | 1.4 mm | 4 | |
| Next | |||||
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.
Change Month
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?
Significant rainfall exceeding 116.7 mm is expected in Slovenia during September, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Slovenia during September?
The average wind speed in Slovenia during September is 9 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Slovenia
Explore the daily rainfall trends and prepare for Slovenias September weather 💧
Typically, Slovenia has 21 rainy days in September with a total of 116.7 mm of rainfall.
UV exposure in Slovenia during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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