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January Weather in Sliven, Bulgaria

Last updated: August 22, 2025

In January, the average temperature in Sliven, Bulgaria hovers around 0°C (33°F). Expect chilly days, with temperatures dipping as low as -14°C (7°F) and peaking at a mild 14°C (57°F). During this month, be prepared for 54 mm (2.1 in) of precipitation spread across 8 days, resulting in an average humidity of 88%—perfect for cozy indoor activities!

January Temperature in Sliven

In January in Sliven, the average temperature is 0°C (33°F). Maximum temperatures can reach 14°C (57°F), while the minimum can drop as low as -14°C (7°F). Be prepared for a chilly adventure and dress accordingly to make the most of your time exploring!

January Weather in Sliven: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Sliven, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sliven, January typically has an average temperature of 0°C (33°F), with highs reaching up to 14°C (57°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec333842506067717365554638
Data source: Temperature data for Sliven generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Sliven

In Sliven in January, the total precipitation amount reaches 54 mm (2.1 in) over a span of 8 days.

January Precipitation Trends in Sliven

The chart displays monthly precipitation patterns in Sliven, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Sliven, January typically receives around 54 mm (2.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec5456755891150823629705989
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Sliven

In Sliven in January, humidity is 88%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and requiring extra layers to stay warm and dry.

January Average Humidity in Sliven

This chart illustrates the average monthly humidity levels in Sliven, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Sliven is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%84%81%70%72%66%62%48%58%78%85%87%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Sliven

In Sliven in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Sliven, you can visit Hourly UV Index in Sliven.

Maximum UV Index Levels in Sliven for January

The chart shows the monthly maximum UV Index (UVI) for Sliven in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Sliven typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2468910997632
Data source: Sliven January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How January Weather in Sliven Compares to Other Months

Weather in Sliven varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Sliven, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sliven, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)54 mm (2.1 inches)88%low
February Weather3°C (38°F)55 mm (2.2 inches)84%moderate
March Weather5°C (42°F)75 mm (2.9 inches)81%high
April Weather10°C (50°F)58 mm (2.3 inches)70%very high
May Weather15°C (60°F)91 mm (3.6 inches)72%very high
June Weather19°C (67°F)150 mm (5.9 inches)66%very high
July Weather22°C (72°F)82 mm (3.2 inches)62%very high
August Weather23°C (73°F)36 mm (1.4 inches)48%very high
September Weather18°C (65°F)29 mm (1.2 inches)58%high
October Weather13°C (55°F)70 mm (2.7 inches)78%high
November Weather8°C (46°F)59 mm (2.3 inches)85%moderate
December Weather3°C (38°F)89 mm (3.5 inches)87%low

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