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The climate in Bulgaria

Average daytime and nighttime temperatures

All climate diagrams on this page result from the collected data of 11 weather stations.
Weather stations at an altitude above 590m have not been included.
All data correspond to the average monthly values of the last 20 years.
Back to overview: Bulgaria
Climate zone: Moderate zone of the northern hemisphere
The climate in Bulgaria is quite varied, but generally does not offer extreme climatic conditions. It is cold, wet and some nice summer months are also present. A beach holiday can also be enjoyed in the warmer season, but water temperatures will not reach much more than 23 °C. The warmest and at the same time rainiest planning region is Central-South / Plovdiv. The coldest is Southwest / Sofia. Due to the warmer temperatures the best time for traveling is from June to September. Less attractive are the cold months from November to March.
Duration of daylight and sunshine in Bulgaria
Compare climate with other regions or countries
Hours of sunshine per daySunshine hours per day in Bulgaria
Rainy days per monthRainy days per month in Bulgaria
Precipitation in mm/dayPrecipitation in Bulgaria
Water temperatureWater temperatures in Bulgaria
Relative humidity in %Relative humidity in Bulgaria
Absolute humidity in g/m³Absolute humidity in Bulgaria

Planning regions in Bulgaria

All figures per year. For detailed climate data click on the name of the region.
Planning regionTemperature
max Ø day
Temperature
min Ø night
Sunshine
hours
Rainy
days
PrecipitationHumidity
Northeast / Varna17.3 °C9.6 °C2,409 h65 515 l79.0 %
Northwest / Montana17.6 °C6.5 °C2,300 h84 657 l76.0 %
Southeast / Burgas19.3 °C8.7 °C2,373 h72 635 l74.0 %
Southwest / Sofia16.6 °C6.1 °C2,263 h89 635 l72.0 %
Central-North / Ruse17.9 °C5.5 °C2,081 h78 661 l
Central-South / Plovdiv20.0 °C8.2 °C2,336 h73 679 l71.0 %

Temperature records of the last 62 years

The hottest temperature measured from 1960 to September 2022 was reported by the Kurdjali weather station. In August 2021 the record temperature of 40.2 °C was reported here. The hottest summer from July to September, based on all 5 weather stations in Bulgaria below 590 metres altitude, was recorded in 2012 with an average temperature of 23.5 °C. This average temperature will normally be measured every 4 to 6 hours, thus also including the nights. Normally, this value is 21.4 degrees Celsius. The average maximum daily temperature at that time was 30.8 °C.
The coldest day in these 62 years was reported by the weather station Varna. Here the temperature dropped to -16.4 °C in January 2006. Varna lies at an altitude of 43 meters above sea level. The coldest winter (January to March) was in 1963 with an average temperature of -0.5 °C. In Bulgaria, it is usual to have about 4.0 degrees more at 3.5 °C for this three-month period.
The most precipitation fell in June 1966. With 10.0 mm per day, the Lom weather station recorded the highest monthly average of the last 62 years.

Long-term development of temperatures from 1999 - 2021

In contrast to single record values, a long-term development cannot simply be brought about by all weather stations in the country. Both the number and the locations are constantly changing. A simply calculated average value would give a falsified result. If several measuring stations in particularly cold mountain or coastal regions are added in one year, the average would already decrease as a result of this alone. If a station fails during the summer or winter months, it does not provide any values and falsifies the average again. The subsequent long-term development was therefore reduced to only 3 measuring points in order to have actually comparable data over as long a period as possible.
In the years 1999 to 2021 there were only these 3 weather stations in the whole country, which reported continuous temperature values (Varna, Vidin, Kurdjali). From these weather reports we have created a long-term development that shows the monthly average temperatures. The hottest month in this entire period was July 2012 with 26.2 °C. January 2017 was the coldest month with an average temperature of -3.0 °C.
The average annual temperature was about 12.5 °C in the years after 1999 and about 13.1 °C in the last years before 2021. It has therefore increased only slightly by about 0.6 °C over the past 23 years. This trend only applies to the selected 3 weather stations in Bulgaria. A considerably more comprehensive evaluation of the global warming has been provided separately.
Long-term development of temperatures in Bulgaria

Data basis and methodology

The data of the individual measuring stations are based on the archives of the German Weather Service, individual values averaged and supplemented by own elements. In order to determine a representative national average, average values were first calculated for each part of the country, which were then summarized at the national level. Thus, if a disproportionate number of weather stations are located in a small area, their number does not affect the national average. There are 6 stations in Bulgaria itself. In 5 cases, neighboring but nearby weather stations were also used to obtain more accurate values.
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