Postojna
September
Weather in Postojna for September 2026
Your guide to Postojna weather in September - trends and predictions
Yellow Wind Warning - See hour by hour.
Until now, September 2026 in Postojna is slightly cooler than the historical average by 1.1 °C.
Expect cooler weather in the next days in Postojna with the forecast suggesting a temperature of 19.9 °C, lower than the historical average.
In general, the average temperature in Postojna at the beginning of September is 24.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.1 °C by the end of September.
Postojna in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 178.9 mm.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
11
Dry days
19
Rainy days
0
Snow days
19°/10°
Temperatures
12 km/h
Avg max wind
81 %
Avg humidity
Postojna Weather September
Move between months or click on a day
Temperatures trend during September in Postojna
See the weather trend as well as the moving average line
September weather in Postojna day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Partly cloudy | 26° /13° | 0 mm | 7 | |
| 2 Sept. | Partly cloudy | 25° /14° | 0.8 mm | 7 | |
| 3 Sept. |  Moderate rain at times | 25° /14° | 4.7 mm | 6 | |
| 4 Sept. |  Sunny | 26° /13° | 0.1 mm | 7 | |
| 5 Sept. | Partly cloudy | 26° /15° | 4.8 mm | 7 | |
| 6 Sept. |  Patchy light rain with thunder | 22° /12° | 2.6 mm | 6 | |
| 7 Sept. | Sunny | 24° /12° | 0 mm | 6 | |
| 8 Sept. |  Light rain shower | 25° /13° | 0.5 mm | 6 | |
| 9 Sept. | Light rain shower | 20° /13° | 8.8 mm | 4 | |
| 10 Sept. | Light rain shower | 19° /11° | 66.4 mm | 3 | |
| 11 Sept. | Patchy rain possible | 18° /10° | 14 mm | 3 | |
| 12 Sept. | Moderate or heavy rain shower | 17° /8° | 32.3 mm | 4 | |
| 13 Sept. | Sunny | 19° /12° | 0 mm | 5.1 | |
| 14 Sept. |  Overcast | 21° /14° | 0 mm | 5.2 | |
| 15 Sept. | Sunny | 21° /13° | 0 mm | 6 | |
| 16 Sept. | Sunny | 21° /15° | 0 mm | 6 | |
| 17 Sept. | Sunny | 18° /15° | 0.6 mm | 5 | |
| 18 Sept. | Light rain shower | 18° /11° | 7.1 mm | 4 | |
| 19 Sept. |  Mist | 19° /13° | 0.5 mm | 4 | |
| 20 Sept. | Overcast | 21° /16° | 0 mm | 6 | |
| 21 Sept. | Overcast | 22° /18° | 3.2 mm | 5 | |
| 22 Sept. | Overcast | 21° /18° | 0 mm | 6 | |
| 23 Sept. | Sunny | 20° /17° | 0.1 mm | 5 | |
| 24 Sept. | Sunny | 19° /16° | 0 mm | 5 | |
| 25 Sept. | Sunny | 19° /15° | 0 mm | 5 | |
| 26 Sept. | Light rain shower | 16° /10° | 2.4 mm | 4 | |
| 27 Sept. | Light rain shower | 17° /11° | 2.9 mm | 4 | |
| 28 Sept. | Patchy light rain with thunder | 17° /7° | 1.7 mm | 5 | |
| 29 Sept. | Fog | 15° /5° | 0 mm | 4 | |
| 30 Sept. | Partly cloudy | 10° /3° | 1.6 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for Postojna 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 Postojna forecast closer to your planned date for the most up-to-date weather information.
Change Month
Postojna in September - FAQ
What are the expected maximum and minimum temperatures in Postojna during September?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Postojna during September?
Significant rainfall exceeding 178.9 mm is expected in Postojna during September, occurring over more than 19 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Postojna during September?
The average wind speed in Postojna during September is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Postojna
Explore the daily rainfall trends and prepare for Postojnas September weather 💧
Typically, Postojna has 19 rainy days in September with a total of 178.9 mm of rainfall.
UV exposure in Postojna during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Quick links
More Postojna weather pages
You are here
Where is Postojna?Get accurate weather forecasts for Postojna, located at latitude 45.774 and longitude 14.215. Stay updated with localized weather information tailored for Postojna.
Found a mistake?
We appreciate your attention to details. Tell us here.