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With daytime temperatures of 8°C (46°F) and nighttime lows of 3°C (37°F), December in Saints Constantine and Helena brings low temperatures during the day. Some rainfall is to be expected during the month.
If you prefer dry days with pleasant temperatures, December may not be the ideal month to visit Saints Constantine and Helena. Our weather planner can help you explore destinations with more pleasant weather conditions.
Pick a month to see the average temperature, rainfall and sunshine in Saints Constantine and Helena - and find the best time to visit.
49-year average (1976-2025)
Based on our historical records, temperatures in Saints Constantine and Helena typically stay consistent throughout December, with daily highs averaging around 8°C (46°F). Nights are cold, with lows typically ranging from -1°C (30°F) to 3°C (37°F).
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Saints Constantine and Helena spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
According to our 28 years of weather records for Saints Constantine and Helena, the following extremes were recorded between 1997 and 2025.
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 is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
Cold weather calls for smart layering in December. A thermal base layer makes a huge difference in staying warm. Add a wool sweater or fleece, then a wind-resistant outer jacket. Rain gear is recommended, you can expect wet weather on multiple days. With water temperatures around 10°C (50°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. With limited sunshine expected, sunglasses aren't a priority for packing.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Saints Constantine and Helena climate overview or explore weather in Bulgaria.
Where to go in December - average daytime high across popular destinations.
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