Sveti Vlas Weather in December
Thinking of visiting Sveti Vlas in December? Expect low temperatures reaching 9°C (48°F) during the day, dropping to 3°C (37°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in Sveti Vlas in December
Historically, the month has about 8 days of rain, averaging 65 mm (2.6 in) in total. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Sveti Vlas in December
In December, expect low temperatures in Sveti Vlas, with highs of 9°C (48°F) and lows of 3°C (37°F) at night. Experience the winter season in December. The days stay cool from start to finish. Layering up well will make outdoor time much more comfortable. At 3°C (37°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in Sveti Vlas in December
The month brings about 103 hours of sunlight, offering a comfortable mix of sun and overcast.
Average water temperature in December
At 11°C (52°F), the water is too cold for most people to swim comfortably. A wetsuit is pretty much essential if you plan to go in.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July, August and September typically offer the best weather for Sveti Vlas.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Bulgaria, check out our Sveti Vlas's climate page.
Sveti Vlas Temperature in December
Min Temperature
3°C (37°F)
Max Temperature
9°C (48°F)
Water Temperature
11°C (52°F) *
Chance of Rain
27%
Precipitation
65 mm (2.6 in)
Rainy days
8 days
Humidity
81% *
Sunshine
103 hours *
Percentage Sunshine
*
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Sveti Vlas typically stay consistent throughout December, with daily highs averaging around 9°C (48°F). Nights are cold, with lows typically ranging from 0°C (32°F) to 3°C (37°F).
Average temperatures in December
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Sveti Vlas in December
Browse day-by-day weather records for Sveti Vlas spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sveti Vlas historical weather extremes in December
Based on 28 years of weather observations (1997-2025), these are the most extreme conditions recorded in Sveti Vlas.
- The hottest December day on record in Sveti Vlas reached 21°C (70°F) (December 2, 2023).
- Sveti Vlas registered its coldest December night on December 19, 1997, with temperatures dropping to -13°C (9°F).
Best Places in Bulgaria in December
Find out more about the weather in Bulgaria and which places have the best travel conditions in this month. See all of Bulgaria in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Sveti Vlas in December
Dress warmly and in layers for your trip to Sveti Vlas in December. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Wet weather is likely, so pack waterproof gear for multiple rainy days. Expect water temperatures of around 11°C (52°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Sveti Vlas in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Bulgaria, check out our Sveti Vlas's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full Sveti Vlas climate overview or explore weather in Bulgaria.
