Average annual temperature is 14.0 °C
Absolute maximum temperature: 37.0 °C
Absolute minimum temperature: -6.2 °C
Number of sunny days: 174 days
Number of rainy days: 183 days
Number of snow days: 8 days
Look at detailed online map of Sliven
* Weather data for Sliven Bulgaria is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 16.9 | 18.8 | 18.5 | 19.7 | 23.3 | 30.4 | 37.0 | 35.1 | 32.5 | 27.0 | 21.9 | 16.2 |
| Average daytime temperature (°C) | 8.8 | 8.6 | 12.1 | 14.7 | 19.6 | 25.5 | 30.8 | 30.7 | 26.6 | 22.3 | 13.6 | 9.9 |
| Average temperature (°C) | 6.0 | 4.3 | 7.8 | 10.3 | 15.1 | 20.3 | 25.0 | 24.7 | 20.9 | 16.9 | 9.6 | 6.5 |
| Average night temperature (°C) | 3.5 | 0.9 | 3.7 | 6.5 | 11.2 | 15.4 | 19.1 | 19.5 | 15.8 | 12.2 | 6.1 | 3.3 |
| Absolute minimum temperature (°C) | -3.8 | -6.2 | -0.7 | 2.0 | 6.0 | 11.3 | 14.8 | 14.5 | 10.1 | 5.8 | -2.2 | -2.1 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.5 | 10.5 | 11.9 | 13.4 | 14.6 | 15.3 | 15.0 | 13.9 | 12.5 | 11.1 | 9.8 | 9.1 |
| Daylight minimum duration (h) | 9.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 3.9 | 7.4 | 7.8 | 8.3 | 10.9 | 12.8 | 13.3 | 12.1 | 10.8 | 9.3 | 5.6 | 5.5 |
| Precipitation (mm) | 116 | 24 | 45 | 114 | 62 | 63 | 48 | 37 | 18 | 18 | 160 | 74 |
| Sunny days | 12 | 19 | 12 | 5 | 10 | 12 | 12 | 17 | 20 | 22 | 12 | 21 |
| Rainy days | 16 | 7 | 18 | 25 | 21 | 18 | 19 | 14 | 10 | 9 | 17 | 9 |
| Snow days | 3 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
The best time to visit Sliven during the most sunny months:
Months with the longest average daylight duration in Sliven:
The largest precipitation sum in Sliven is at