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April Weather in Sliven, Bulgaria

Last updated: August 22, 2025

In April, the average temperature in Sliven, Bulgaria hovers around 10°C (50°F). While you may experience a chilly minimum of -1°C (30°F), the warmest days can reach up to 26°C (79°F). Expect about 58 mm (2.3 in) of precipitation spread across 10 days, and prepare for an average humidity level of 70%—perfect for that cozy, rainy day vibe!

April Temperature in Sliven

In April in Sliven, the average temperature is 10°C (50°F). Maximums can reach 26°C (79°F), while minimums can drop as low as -1°C (30°F). Pack accordingly to enjoy a comfortable trip, as temperatures can vary significantly during your stay.

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

The chart illustrates April 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, April typically has an average temperature of 10°C (50°F), with highs reaching up to 26°C (79°F) and lows dropping to around -1°C (30°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.

April Precipitation in Sliven

In Sliven in April, the total precipitation amount is 58 mm (2.3 in), measured over a span of 10 days.

April Precipitation Trends in Sliven

The chart displays monthly precipitation patterns in Sliven, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Sliven, April typically receives around 58 mm (2.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec5456755891150823629705989
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Sliven

In Sliven in April, humidity is 70%. With an average temperature of 10°C (50°F), this humidity feels like a cool embrace on your skin, making it a refreshing yet damp experience for traveling.

April Average Humidity in Sliven

This chart illustrates the average monthly humidity levels in Sliven, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Sliven is approximately 70%, 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 April generated using information from the Copernicus Climate Change Service.

April UV Index in Sliven

In Sliven in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Sliven.

Maximum UV Index Levels in Sliven for April

The chart shows the monthly maximum UV Index (UVI) for Sliven in April, 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 April, the maximum UV index in Sliven typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2468910997632
Data source: Sliven April 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 April 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 April’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 April’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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