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Weather & Climate in Sliven, Bulgaria
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sliven experiences four distinct seasons with an average annual temperature of 49°F (10°C). Winters average 31°F in January while summers reach 67°F in July. The area gets 289 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 25.7 inches (drier than the 38-inch national average). The area receives 5.7 inches of snow annually. The city sits at an elevation of 922 feet.
Temperature
31°F Jan (-0°C)
67°F Jul (19°C)
| Annual Average | 49.3°F |
| 9% below US avg | |
| January Average | 31°F (-0°C) |
| July Average | 67°F (19°C) |
| Sunny Days | 289 days/yr |
Geography
| Elevation | 922 ft (281 m) |
| Area | 74.8 sq mi (193.8 km²) |
| Population Density | 1,119/sq mi |
| Coordinates | 42.6861°N, 26.3256°W |
| Timezone | Europe/Sofia |
Precipitation & Snow
Air Quality
Earthquake History
116 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.7.
| Dec 11, 1998 | 7 km NW of Chirpan, Bulgaria | M4.7 | 99 km | 10 km |
| Apr 5, 2002 | 4 km NE of Asenovgrad, Bulgaria | M4.7 | 137 km | 27 km |
| Aug 13, 2001 | 13 km N of Yambol, Bulgaria | M4.6 | 18 km | 10 km |
| Feb 20, 2006 | 16 km ENE of Kardzhali, Bulgaria | M4.6 | 126 km | 10 km |
| Apr 4, 2022 | 14 km SE of Provadia, Bulgaria | M4.6 | 110 km | 10 km |
| Jun 7, 2023 | Bulgaria | M4.6 | 141 km | 10 km |
| Nov 23, 1999 | 5 km SW of Parvomay, Bulgaria | M4.5 | 118 km | 4 km |
| May 1, 2020 | 6 km SW of Rakovski, Bulgaria | M4.5 | 128 km | 10 km |
| Feb 21, 2018 | 3 km NNW of Asenovgrad, Bulgaria | M4.4 | 140 km | 12 km |
| Oct 7, 2010 | 14 km NW of Dolni Chiflik, Bulgaria | M4.4 | 110 km | 10 km |
| Apr 18, 2016 | 10 km SSW of Nova Zagora, Bulgaria | M4.3 | 43 km | 5 km |
| May 14, 2004 | 12 km SW of Razgrad, Bulgaria | M4.2 | 85 km | 24 km |
| Apr 15, 2008 | 6 km NE of Gabrovo, Bulgaria | M4.2 | 80 km | 10 km |
| Aug 9, 2001 | 8 km NNE of Yambol, Bulgaria | M4.2 | 22 km | 42 km |
| Aug 24, 1992 | 13 km SSW of Kalofer, Bulgaria | M4.2 | 118 km | 10 km |
| Feb 5, 2015 | 12 km ENE of Tvarditsa, Bulgaria | M4.2 | 23 km | 10 km |
| Jan 3, 2017 | 8 km ENE of Lyaskovets, Bulgaria | M4.2 | 66 km | 21 km |
| Jun 24, 2011 | Bulgaria | M4.1 | 59 km | 0 km |
| Aug 21, 2010 | 18 km SE of Nova Zagora, Bulgaria | M4.1 | 40 km | 0 km |
| Aug 14, 1996 | 12 km N of Mineralni Bani, Bulgaria | M4.1 | 108 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-0°C) | 1.7 in | Coldest, Driest |
| February | 33°F (1°C) | 1.9 in | |
| March | 39°F (4°C) | 1.9 in | |
| April | 48°F (9°C) | 2.4 in | |
| May | 57°F (14°C) | 2.8 in | |
| June | 63°F (17°C) | 2.9 in | Wettest |
| July | 67°F (19°C) | 2.2 in | |
| August | 67°F (19°C) | 2.0 in | Warmest |
| September | 60°F (15°C) | 1.7 in | |
| October | 51°F (11°C) | 1.8 in | |
| November | 42°F (5°C) | 2.3 in | |
| December | 35°F (1°C) | 2.2 in |
Sliven has a seasonal temperature swing of 36°F / from 31°F in January to 67°F in August. Total annual precipitation is 25.7 inches, with June being the wettest month (2.9") and January the driest (1.7").