December Weather in Sveti Vlas, Bulgaria

Last updated: August 21, 2025

December in Sveti Vlas, Bulgaria serves as a captivating transitional month, showcasing a mix of mild and chilly weather. With maximum temperatures reaching 19°C (66°F) and an average of 7°C (45°F), winter bears a gentle touch here. Yet, the mercury can dip as low as -5°C (24°F), offering a hint of frost that complements the festive atmosphere. Expect around 75 mm (2.9 in) of precipitation over 10 days, contributing to a notable humidity level of 84%. This unique blend of climate attributes makes December a fascinating time to experience the coastal charm of Sveti Vlas while savoring its winter tranquility.

December Temperature in Sveti Vlas

In December, Sveti Vlas, Bulgaria, experiences a distinctive winter charm. Temperatures typically range from a brisk -5°C (24°F) at night to a mild 19°C (66°F) during the day, with an average of around 7°C (45°F). This month marks a gradual transition as the colder temperatures emerge from the preceding autumn, contrasting sharply with the summer highs that can reach up to 33°C (91°F). The chilly evenings invite cozy gatherings, while the mild afternoons provide a refreshing opportunity for exploring the town's scenic beaches and stunning views. December's temperatures hint at the serene beauty of a Bulgarian winter, making it an enchanting time to visit Sveti Vlas.

December Weather in Sveti Vlas: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Sveti Vlas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sveti Vlas, December typically has an average temperature of {2}°C ({3}°F), with highs reaching up to {4}°C ({5}°F) and lows dropping to around {6}°C ({7}°F).
JanFebMarAprMayJunJulAugSepOctNovDec394245516170747669605244
Data source: Temperature data for Sveti Vlas 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.

December Precipitation in Sveti Vlas

In December, Sveti Vlas experiences a notable increase in precipitation, with a total of 75 mm (2.9 in) recorded over 10 days—making it one of the wetter months of the year. This uptick follows the trends of the preceding months, particularly October and November, which also brought significant rainfall. The winter months, December included, generally see a higher frequency of rainy days compared to the summer, evident in the contrast to August's mere 3 days of precipitation. As the calendar year closes, this seasonal shift not only enhances the local landscape but also contributes to maintaining the region's lush environment through the cooler months.

December Precipitation Trends in Sveti Vlas

The chart displays monthly precipitation patterns in Sveti Vlas, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Sveti Vlas, December typically receives around {2} mm ({3} inches) of precipitation spread over approximately {4} days.
JanFebMarAprMayJunJulAugSepOctNovDec664957404682501522695975
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sveti Vlas

In Sveti Vlas, Bulgaria, December sees a return to higher humidity levels, reaching 84%, reminiscent of the moisture-laden air felt in January. This late-autumn increase contrasts significantly with the drier summer months, where humidity levels dipped to a low of 60% in August. The gradual rise from 69% in July to 84% in December reflects seasonal transitions, marking a shift from the warmth of summer to the cooler, more humid winter. Interestingly, November's humidity remains elevated at 81%, indicating a consistent pattern of increased moisture leading into the new year. Thus, while December is synonymous with cooler temperatures, it also carries the weight of the year’s highest humidity, enveloping Sveti Vlas in a dense, atmospheric embrace.

December Average Humidity in Sveti Vlas

This chart illustrates the average monthly humidity levels in Sveti Vlas, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Sveti Vlas is approximately {2}%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%81%79%75%77%71%69%60%63%76%81%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sveti Vlas

In Sveti Vlas, Bulgaria, the UV Index experiences a noteworthy shift throughout the year, highlighting the changing sun exposure as winter approaches. December sees a return to a low UV Index of 2, allowing for safer outdoor activities with a burn time of 45 minutes. This marks a contrast to the peak summer months of June, July, and August, when the UV Index reaches a scorching 9, urging caution with a mere 15-minute burn time. The gradual climb through spring, peaking in summer, with a gradual decline into the more moderate levels of fall and winter, showcases the seasonal dynamics of sun exposure. As the year wraps up, if you're planning to soak in the winter sun, take advantage of December's low index while it lasts. For more detailed information about UV levels, visit Sveti Vlas UV Index.

Maximum UV Index Levels in Sveti Vlas for December

The chart shows the monthly maximum UV Index (UVI) for Sveti Vlas in December, 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 December, the maximum UV index in Sveti Vlas typically reaches {2}, which falls under the {3} exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246789997532
Data source: Sveti Vlas December 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.

December Sunshine in Sveti Vlas

In Sveti Vlas, Bulgaria, December welcomes a gentle embrace of sunlight with 210 hours of bright, cheerful days to wrap up the year. While this is less than the sun-drenched peak of July with its impressive 429 hours, December still offers a delightful contrast to the dimming daylight of winter. As the months progress from January's 165 hours to December, a clear pattern emerges—sunshine hours steadily increase, reaching their zenith in mid-summer. However, even as the year comes to a close, December's relatively abundant hours of sunshine maintain a warm spirit, suggesting that this coastal gem is not ready to relinquish its radiant charm just yet.

Monthly Sunshine Duration in Sveti Vlas: December Highlighted

The December sunshine duration represents the total number of hours Sveti Vlas experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec165h227h289h349h396h405h429h405h341h284h223h210h
Data source: Sveti Vlas December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Sveti Vlas During December

As December rolls into Sveti Vlas, Bulgaria, the likelihood of sunny days begins to taper off, with a sun chance of 33%. This marks a slight increase from the gloomier November, which offered just 31% sunshine. However, it's a significant drop compared to the bright summer months, where sunshine peaks at 77% in July. Interestingly, while winter sets in, the chances of a sunny December hover closer to early spring, showcasing the shifting dynamics of weather in this picturesque coastal town. Visitors should prepare for a mix of sun and clouds, as the year winds down, celebrating the cozy charm of Sveti Vlas amidst its crisp winter air.

Percentage of Sunny Days in December in Sveti Vlas

The chart illustrates the percentage of sunny days in Sveti Vlas throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Sveti Vlas experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec29%41%44%45%46%43%77%75%53%32%31%33%
Data source: Sveti Vlas December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Sveti Vlas in December

In Sveti Vlas, Bulgaria, December marks the end of a steady decline in daylight hours that begins in the fall. As winter approaches, the town experiences only 9 hours of daylight, mirroring January's low light conditions. This pattern reflects a broader trend across the months: daylight duration gradually increases from just 9 hours in January to a peak of 15 hours in June. Following this mid-year zenith, daylight begins to taper off, with a return to shorter days by autumn. The gradual ebb and flow of light not only shapes the daily rhythm of life in Sveti Vlas but also enhances the charm of its winter ambiance, inviting residents and visitors alike to embrace the beauty of the season.

Average Daylight Hours in Sveti Vlas for December

The chart illustrates the variation in daylight duration in Sveti Vlas throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 25m10h 32m11h 57m13h 23m14h 37m15h 14m14h 55m13h 50m12h 26m11h9h 44m9h 5m
Data source: Sveti Vlas daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Sveti Vlas

In December, the winds in Sveti Vlas pick up noticeably, with an average wind speed reaching 4.7 m/s (11 mph), making it the windiest month of the year. This uptick follows a gradual increase through the autumn, where wind speeds hovered around 3.6 m/s to 4.6 m/s from November to October. Interestingly, while winter typically brings calmer conditions in many regions, December's winds suggest a shift, presenting a vibrant and invigorating atmosphere that complements the beauty of the Bulgarian coast. As the year concludes, the breezy December air invites both locals and visitors to embrace the elegance of the season, hinting at the dynamic climate that characterizes this charming seaside town.

Average December Wind Speed in Sveti Vlas

The chart displays monthly wind speed patterns in Sveti Vlas, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec4.53.94.12.93.22.83.23.03.94.63.64.7 m/s
Data source: Sveti Vlas December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Sveti Vlas Compares to Other Months

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

December and January exhibit notable differences in weather patterns. In December, temperatures range from a minimum of -5°C (24°F) to a maximum of 19°C (66°F), with an average of 7°C (45°F). The month experiences about 75 mm (2.9 in) of precipitation over approximately 10 days, while maintaining a high humidity level of 84%. In contrast, January sees colder conditions, with temperatures dropping further to a minimum of -10°C (14°F) and an average of 4°C (39°F), peaking at 16°C (61°F). Precipitation decreases slightly to 66 mm (2.6 in) over about 8 days, yet the humidity remains consistent at 84%. For more detailed information, you can check the Sveti Vlas weather in January.

In December, temperatures range from a low of -5°C (24°F) to a high of 19°C (66°F), with an average temperature of 7°C (45°F). The month experiences about 75 mm (2.9 in) of precipitation over approximately 10 days, contributing to a humidity level of 84%. Conversely, February sees slightly cooler temperatures, with a minimum of -5°C (23°F) and a maximum of 17°C (63°F), averaging around 6°C (42°F). Precipitation drops to 48 mm (1.9 in) across 7 days, and humidity decreases slightly to 81%. For a closer look at the weather conditions in February, you can visit Sveti Vlas weather in February.

In comparing the weather of December and March, both months exhibit similar average temperatures of around 7°C (45°F), but they differ in their extremes. December experiences a milder minimum temperature of -5°C (24°F) compared to March's colder -9°C (16°F). Despite both months reaching a maximum of 19°C (66-67°F), December is slightly wetter, receiving 75 mm (2.9 in) of precipitation over 10 days, while March has less at 57 mm (2.3 in) over just 9 days. Additionally, humidity levels are higher in December at 84%, compared to March's 79%. For more detailed insights on the March climate, check out Sveti Vlas weather in March.

When comparing the weather in December and April, there are notable differences in temperature and precipitation. December experiences a chillier climate with minimum temperatures reaching as low as -5°C (24°F) and an average of 7°C (45°F), while April warms up with a minimum of 2°C (36°F) and an average of 10°C (51°F). The maximum temperatures also reflect this transition, peaking at 19°C (66°F) in December and rising to 23°C (73°F) in April. In terms of precipitation, December sees more rain, with 75 mm (2.9 in) over approximately 10 days, compared to April's 40 mm (1.6 in) spread over just 7 days. Additionally, humidity levels are higher in December at 84% compared to 75% in April. For a closer look at April's climate, you can check out Sveti Vlas weather in April.

December and May showcase contrasting weather patterns. In December, temperatures can dip as low as -5°C (24°F) with an average of 7°C (45°F), while highs reach up to 19°C (66°F). The month sees significant precipitation, totaling 75 mm (2.9 in) over approximately 10 days, and humidity levels are relatively high at 84%. In stark contrast, May experiences milder temperatures with a minimum of 7°C (45°F), an average of 16°C (62°F), and a maximum of 27°C (81°F). Precipitation in May is lower at 46 mm (1.8 in) over 8 days, and humidity is slightly reduced at 77%. For a more detailed look at May weather, check Sveti Vlas weather in May.

In December, the weather is characterized by cooler temperatures with a minimum of -5°C (24°F) and an average of 7°C (45°F), reaching a maximum of 19°C (66°F). The month experiences significant humidity at 84% and approximately 75 mm (2.9 in) of precipitation over 10 days. In contrast, June brings much warmer conditions, with temperatures ranging from a minimum of 12°C (53°F) to an average of 21°C (70°F), peaking at 30°C (87°F). Despite slightly higher precipitation at 82 mm (3.2 in) over 14 days, the humidity level is lower at 71%. For more specific details, check out the Sveti Vlas weather in June.

In December, temperatures can dip as low as -5°C (24°F) and reach a maximum of 19°C (66°F), with an average of 7°C (45°F). The month is characterized by higher humidity at 84% and sees about 75 mm (2.9 in) of precipitation spread over approximately 10 days. In contrast, July offers a much warmer climate, with minimum temperatures around 16°C (62°F) and peaks of 33°C (91°F), averaging 23°C (75°F). The summer month experiences lower humidity at 69% and less precipitation, totaling 50 mm (2.0 in) across about 7 days. For more detailed insights into the pleasant July weather, check Sveti Vlas weather in July.

December and August present contrasting weather experiences. In December, temperatures can drop as low as -5°C (24°F), with an average of 7°C (45°F) and a maximum of 19°C (66°F). This chilly month is characterized by higher humidity at 84% and substantial precipitation, averaging 75 mm (2.9 in) over roughly 10 days. In stark contrast, August boasts much warmer conditions, with temperatures ranging from a minimum of 16°C (62°F) to a peak of 33°C (91°F), alongside a comfortable average of 24°C (76°F). With only 15 mm (0.6 in) of rain falling on about 3 days, August experiences significantly lower humidity at 60%. For more details on the delightful weather in August, visit Sveti Vlas weather in August.

December and September present contrasting weather conditions. In December, temperatures range from a chilly -5°C (24°F) at night to a mild 19°C (66°F) during the day, with an average of 7°C (45°F). The month sees a higher humidity level of 84% and a significant amount of precipitation, averaging 75 mm (2.9 in) over about 10 days. In contrast, September enjoys much warmer temperatures, with nighttime lows around 10°C (50°F) and daytime highs reaching 30°C (86°F), averaging 21°C (69°F). It features lower humidity at 63% and substantially less rainfall, totaling just 22 mm (0.9 in) over approximately 5 days. For more insights into the September climate, you can check Sveti Vlas weather in September.

In comparing the weather between December and October, notable differences emerge. October experiences milder temperatures, with a minimum of 7°C (45°F) and a maximum of 27°C (81°F), averaging around 15°C (60°F). In contrast, December sees much cooler conditions, with temperatures dipping to a minimum of -5°C (24°F) and averaging around 7°C (45°F), peaking at 19°C (66°F).

Precipitation levels are relatively similar, with October receiving 69 mm (2.7 in) over 7 days, while December has slightly higher precipitation at 75 mm (2.9 in) over 10 days. Humidity also varies, with October having an average of 76% compared to December's 84%. For more insights about the October weather, you can check Sveti Vlas weather in October.

In comparing the weather between November and December, we can observe a distinct shift as temperatures drop and precipitation levels rise. November offers milder conditions with an average temperature of 11°C (52°F), reaching up to a maximum of 23°C (74°F), while December sees a notable decline in temperatures, averaging 7°C (45°F) with maximums only reaching 19°C (66°F). Additionally, December experiences increased precipitation at 75 mm (2.9 in) over approximately 10 days, compared to November's 59 mm (2.3 in) over 8 days. This shift is complemented by slightly higher humidity in December at 84%, compared to November's 81%. For a closer look at the weather specifics in November, you can visit Sveti Vlas weather in November.

Compare Sveti Vlas's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Sveti Vlas

As December settles over Sveti Vlas, the weather takes on a starkly different character compared to the milder months of fall. With cooler temperatures averaging around 7°C (45°F), the chill becomes more pronounced, contrasting sharply with the warmer autumn days. The likelihood of rain also increases, with precipitation occurring on about 10 days, contributing to a more humid atmosphere that feels quite different from the drier summer months. Those looking to experience a quieter, more reflective time in this coastal town will find December's unique weather both refreshing and invigorating. To learn more about how the climate evolves throughout the year, visit Sveti Vlas Climate.