Sliven, where it's located

The climate of Sliven is continental, with cold winters and hot summers.
The city is located in eastern Bulgaria, 90 km (55 mi) from the sea, in the Thracian plain, but a short distance from the mountains, the eastern part of the Balkan mountains (in particular, the Sinite Kamani massif).
The average temperature of the coldest month (January) is of 3.1 °C (38 °F), that of the warmest month (August) is of 25.3 °C (77 °F). Here are the average temperatures.
Sliven - Average temperatures
Min (°C)014913171919151061
Max (°C)781318242831312620148
Min (°F)323439485563666659504334
Max (°F)454655647582888879685746

Precipitation amounts to 585 millimeters (23 inches) per year: so, it is at an intermediate level. It ranges from 30 mm (1.2 in) in the driest months (March, September) to 65 mm (2.6 in) in the wettest ones (May, June). Here is the average precipitation.
Sliven - Average precipitation

On average, there are around 2,440 sunshine hours per year. Here are the average sunshine hours per day.
Sliven - Sunshine


Best Time

The best times to visit Sliven are spring and autumn, namely the months of May and September. In June, the weather is often excellent, but it can sometimes get hot, especially in the second half of the month.