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Monthly climate in Sliven, Bulgaria

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Sliven features a oceanic climate (Cfb).Temperatures typically range between 0 °C (33 °F) and 23 °C (73 °F) through the year, but rarely can drop to -17 °C (1 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 848 mm (33.4 inches) and receives 120 rainy days on the 1 mm (0.04 inches) threshold annually.Sliven enjoys an average of 3668 hours of sunshine throughout the year, and daylight varies from 9 hours 5 minutes to 15 hours 15 minutes per day.

Monthly average temperatures in Sliven, Bulgaria §

The warmest months in Sliven are June, July and August, with daily mean temperatures ranging from 19 to 23 °C (67 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 0 to 3 °C (33 - 38 °F) throughout the day. On average each year, Sliven experiences 73 days above 25 °C (77.0 °F) and 66 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Sliven, Bulgaria.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 14°C
(57°F)		 17°C
(63°F)		 20°C
(69°F)		 26°C
(79°F)		 29°C
(85°F)		 33°C
(92°F)		 36°C
(97°F)		 37°C
(99°F)		 32°C
(90°F)		 29°C
(85°F)		 24°C
(76°F)		 16°C
(61°F)
Mean maximum 11°C
(53°F)		 15°C
(60°F)		 19°C
(66°F)		 22°C
(72°F)		 27°C
(81°F)		 30°C
(86°F)		 34°C
(93°F)		 33°C
(92°F)		 30°C
(87°F)		 24°C
(76°F)		 20°C
(68°F)		 14°C
(57°F)
Average high 4°C
(39°F)		 7°C
(45°F)		 10°C
(50°F)		 15°C
(60°F)		 21°C
(69°F)		 24°C
(76°F)		 27°C
(81°F)		 29°C
(84°F)		 24°C
(76°F)		 18°C
(65°F)		 11°C
(52°F)		 6°C
(43°F)
Daily mean 0°C
(33°F)		 3°C
(38°F)		 5°C
(42°F)		 10°C
(50°F)		 15°C
(60°F)		 19°C
(67°F)		 22°C
(72°F)		 23°C
(73°F)		 18°C
(65°F)		 13°C
(55°F)		 8°C
(46°F)		 3°C
(38°F)
Average low -3°C
(27°F)		 -1°C
(31°F)		 1°C
(34°F)		 5°C
(41°F)		 10°C
(51°F)		 15°C
(58°F)		 17°C
(62°F)		 17°C
(62°F)		 13°C
(55°F)		 8°C
(47°F)		 5°C
(40°F)		 0°C
(33°F)
Mean minimum -11°C
(12°F)		 -9°C
(16°F)		 -7°C
(20°F)		 -1°C
(31°F)		 5°C
(41°F)		 10°C
(50°F)		 13°C
(56°F)		 13°C
(55°F)		 6°C
(42°F)		 3°C
(37°F)		 -2°C
(30°F)		 -7°C
(20°F)
Minimum -14°C
(7°F)		 -10°C
(14°F)		 -17°C
(1°F)		 -1°C
(30°F)		 3°C
(37°F)		 7°C
(45°F)		 11°C
(53°F)		 11°C
(52°F)		 3°C
(37°F)		 -0°C
(32°F)		 -4°C
(24°F)		 -9°C
(16°F)

Compare climate in Sliven with other places

Compare temperature, precipitation, sunshine, UV index in Sliven, Bulgaria with other places around the world.

Monthly average precipitation in Sliven, Bulgaria §

Sliven usually has the most precipitation in May, June and December, with an average of 14 rainy days and 110 mm (4.3 inches) of precipitation per month.The driest months in Sliven are January, August and September. On average, 40 mm (1.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Sliven, Bulgaria.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 54 (2.1) 55 (2.2) 75 (2.9) 58 (2.3) 91 (3.6) 150 (5.9) 82 (3.2) 36 (1.4) 29 (1.2) 70 (2.7) 59 (2.3) 89 (3.5)
Average precipitation days (≥ 1 mm) 8 8 11 10 13 18 12 7 5 7 8 13

Monthly sunshine hours in Sliven, Bulgaria §

The sunniest months in Sliven are June, July and August, when the sun shines an average of 13 hours 19 minutes a day.Least sunny months in Sliven: January, November and December receive an average of 6 hours 18 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Sliven, Bulgaria.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 167 229 281 341 390 396 425 403 341 278 214 198
Mean daily daylight hours 9h 25m 10h 32m 11h 57m 13h 24m 14h 37m 15h 15m 14h 55m 13h 50m 12h 26m 11h 0m 9h 44m 9h 5m

Solar UV radiation in Sliven, Bulgaria §

Sliven experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Sliven UV Index data.

Average daily maximum UV levels by month for Sliven, Bulgaria.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 4 6 8 9 10 9 9 7 6 3 2