Postojna
September
Weather in Postojna for September 2025
Your guide to Postojna weather in September - trends and predictions
In general, the average temperature in Postojna at the beginning of September is 27 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.7 °C by the end of September.
The climate of Postojna in September is notably wet, with an average of 15 rainy days, and a total of 160.6 mm of precipitation.
Is September a good time to visit Postojna? check out the best time to travel to Postojna page.
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Temperatures
Rain 🌧️
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15
Dry days
15
Rainy days
0
Snow days
19°/10°
Temperatures
14 km/h
Avg max wind
79 %
Avg humidity
Postojna in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  30° | 2 30° | 3  28° | 4  27° | 5 28° | 6  21° | 7 25° |
| 8  24° | 9 17° | 10 22° | 11 22° | 12 14° | 13  11° | 14 13° |
| 15 14° | 16 17° | 17 12° | 18 17° | 19 17° | 20 15° | 21  19° |
| 22 20° | 23 20° | 24 16° | 25 16° | 26 16° | 27 18° | 28 18° |
| 29 14° | 30 12° |
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Temperatures trend during September in Postojna
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 | 30° /17° | 0 mm | 8 | |
| 2 Sept. | Partly cloudy | 30° /17° | 0 mm | 8 | |
| 3 Sept. | Moderate rain at times | 28° /15° | 12 mm | 6 | |
| 4 Sept. | Sunny | 27° /14° | 0.3 mm | 7 | |
| 5 Sept. | Partly cloudy | 28° /14° | 9.9 mm | 7 | |
| 6 Sept. | Patchy light rain with thunder | 21° /14° | 7.7 mm | 5 | |
| 7 Sept. | Sunny | 25° /12° | 0 mm | 7 | |
| 8 Sept. | Light rain shower | 24° /13° | 1.5 mm | 5 | |
| 9 Sept. | Light rain shower | 17° /12° | 17.2 mm | 4 | |
| 10 Sept. | Light rain shower | 22° /10° | 0.8 mm | 5 | |
| 11 Sept. | Patchy rain possible | 22° /10° | 0.4 mm | 5 | |
| 12 Sept. | Moderate or heavy rain shower | 14° /5° | 59.4 mm | 3 | |
| 13 Sept. | Light drizzle | 11° /5° | 4.6 mm | 3 | |
| 14 Sept. | Light rain | 13° /6° | 6.9 mm | 3 | |
| 15 Sept. | Patchy rain possible | 14° /6° | 0.2 mm | 3 | |
| 16 Sept. | Light rain shower | 17° /4° | 3.1 mm | 4 | |
| 17 Sept. | Patchy rain possible | 12° /6° | 1.4 mm | 3 | |
| 18 Sept. | Partly cloudy | 17° /7° | 0.2 mm | 5 | |
| 19 Sept. | Patchy rain possible | 17° /10° | 0.2 mm | 4 | |
| 20 Sept. | Patchy rain possible | 15° /10° | 0.1 mm | 4 | |
| 21 Sept. | Mist | 19° /7° | 0 mm | 4 | |
| 22 Sept. | Partly cloudy | 20° /7° | 0 mm | 6 | |
| 23 Sept. | Patchy rain possible | 20° /9° | 0.6 mm | 5 | |
| 24 Sept. | Light rain shower | 16° /11° | 18.8 mm | 4 | |
| 25 Sept. | Light rain shower | 16° /9° | 5.8 mm | 4 | |
| 26 Sept. | Light rain shower | 16° /12° | 1.3 mm | 4 | |
| 27 Sept. | Light rain shower | 18° /15° | 4.9 mm | 4 | |
| 28 Sept. | Patchy light rain with thunder | 18° /8° | 3.5 mm | 4 | |
| 29 Sept. | Fog | 14° /4° | 0 mm | 3 | |
| 30 Sept. | Partly cloudy | 12° /2° | 0 mm | 4 | |
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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.
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 160.6 mm is expected in Postojna during September, occurring over more than 15 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 14 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Postojna in September?
As you prepare for your trip to Postojna 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 Postojna, 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
- 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 Postojna
Explore the daily rainfall trends and prepare for Postojnas September weather 💧
UV exposure in Postojna during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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