Weather in Sliven for September 2026
Until now, September 2026 in Sliven is slightly cooler than the historical average by 1.5 °C.
The forecast for the next days in Sliven predicts temperatures to be around 19 °C, close to the historical average.
In general, the average temperature in Sliven at the beginning of September is 29.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.7 °C by the end of September.
Sliven experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 39 mm.
Is September a good time to visit Sliven? check out the best time to travel to Sliven page.
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Sliven Weather September
Temperatures trend during September in Sliven
September weather in Sliven day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 30° /15° | 0.1 mm | 7 | |
| 2 Sept. |  Patchy rain possible | 31° /18° | 0 mm | 7 | |
| 3 Sept. |  Partly cloudy | 32° /18° | 0.2 mm | 6 | |
| 4 Sept. | Sunny | 29° /17° | 0.2 mm | 8 | |
| 5 Sept. | Sunny | 30° /16° | 0 mm | 8 | |
| 6 Sept. |  Moderate rain at times | 29° /16° | 0.3 mm | 7 | |
| 7 Sept. | Patchy rain possible | 26° /14° | 0.2 mm | 7 | |
| 8 Sept. | Sunny | 26° /13° | 0 mm | 7 | |
| 9 Sept. | Sunny | 28° /13° | 0 mm | 7 | |
| 10 Sept. | Patchy rain possible | 28° /15° | 0.7 mm | 7 | |
| 11 Sept. | Sunny | 27° /15° | 8.1 mm | 6 | |
| 12 Sept. | Sunny | 27° /15° | 1.8 mm | 6 | |
| 13 Sept. | Moderate rain at times | 24° /14° | 5.9 mm | 5 | |
| 14 Sept. | Moderate rain at times | 24° /12° | 4.7 mm | 6 | |
| 15 Sept. | Patchy rain possible | 23° /11° | 1.2 mm | 5 | |
| 16 Sept. |  Overcast | 23° /12° | 0.3 mm | 5 | |
| 17 Sept. | Sunny | 23° /11° | 0.8 mm | 6 | |
| 18 Sept. | Patchy rain possible | 23° /11° | 0.4 mm | 6 | |
| 19 Sept. | Overcast | 25° /14° | 0 mm | 5.3 | |
| 20 Sept. | Sunny | 25° /16° | 0 mm | 5.3 | |
| 21 Sept. | Sunny | 24° /17° | 0 mm | 5.2 | |
| 22 Sept. | Sunny | 17° /12° | 0 mm | 5 | |
| 23 Sept. | Sunny | 15° /8° | 0 mm | 5 | |
| 24 Sept. | Sunny | 17° /9° | 0 mm | 5 | |
| 25 Sept. | Overcast | 18° /10° | 0 mm | 4 | |
| 26 Sept. | Sunny | 20° /11° | 0 mm | 5 | |
| 27 Sept. | Sunny | 16° /9° | 0 mm | 5 | |
| 28 Sept. | Sunny | 16° /7° | 0 mm | 5 | |
| 29 Sept. | Sunny | 20° /10° | 0 mm | 5 | |
| 30 Sept. | Sunny | 17° /10° | 0 mm | 5 | |
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Sliven weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Sunny | Sunny |
| Temperatures | 31°/17° | 25°/13° | 17°/7° |
| Rainfall | 19 mm | 39 mm | 77 mm |
| Wind | 16.8 km/h | 15.9 km/h | 11.5 km/h |
| Humidity | 45% | 56% | 66% |
| Rainy days | 6 days | 7 days | 12 days |
| Dry days | 25 days | 23 days | 19 days |
Planning a trip to Sliven? Discover the best time to visit
Sliven in September - FAQ
What are the expected maximum and minimum temperatures in Sliven during September?
How much rainfall should be expected in Sliven during September?
What are the typical wind conditions in Sliven during September?
September rainfall patterns in Sliven
UV exposure in Sliven during September
What to pack to Sliven in September?
Mild & changeable · highs around 25 °C, occasional showers
As you prepare for your trip to Sliven 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 Sliven, during September, is comfortable and enjoyable, regardless of the weather conditions.
🧥 Clothing
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Where is Sliven?Get accurate weather forecasts for Sliven, located at latitude 42.686 and longitude 26.329. Stay updated with localized weather information tailored for Sliven.