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The climate in Slovenia

Average daytime and nighttime temperatures


All climate diagrams on this page result from the collected data of 12 weather stations.
All data correspond to the average monthly values of the last 20 years.


Back to overview: Slovenia

Climate zone: Moderate zone of the northern hemisphere

The climate in Slovenia 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 rainiest part of the country is Obalno-kraška. The coldest is Primorsko-notranjska. 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 Slovenia
Compare climate with other regions or countries
Hours of sunshine per daySunshine hours per day in Slovenia
Rainy days per monthRainy days per month in Slovenia
Precipitation in mm/dayPrecipitation in Slovenia
Water temperatureWater temperatures in Slovenia
Relative humidity in %Relative humidity in Slovenia
Absolute humidity in g/m³Absolute humidity in Slovenia

Country parts in Slovenia

All figures per year. For detailed climate data click on the name of the region.

country partTemperature
max Ø day
Temperature
min Ø night
Sunshine
hours
Rainy
days
PrecipitationHumidity
Gorenjska16.8 °C8.0 °C2,081 h98 1,121 l75.0 %
Goriška16.8 °C8.0 °C2,081 h98 1,121 l75.0 %
Jugovzhodna Slovenija16.4 °C7.1 °C1,971 h108 1,369 l82.0 %
Koroška16.0 °C6.2 °C2,044 h102 1,157 l81.0 %
Obalno-kraška19.2 °C12.2 °C2,190 h88 902 l65.0 %
Osrednjeslovenska16.4 °C7.1 °C1,971 h108 1,369 l82.0 %
Posavska17.3 °C9.3 °C2,008 h96 883 l71.0 %
Primorsko-notranjska15.6 °C6.0 °C2,044 h103 1,226 l81.0 %
Savinjska16.9 °C8.3 °C2,081 h97 1,062 l74.0 %
Zasavska16.4 °C7.1 °C1,971 h108 1,369 l82.0 %

Temperature records of the last 47 years

The hottest temperature measured from 1975 to March 2022 was reported by the Ljubljana Bezigrad weather station. In August 2013 the record temperature of 40.2 °C was reported here. The hottest summer from July to September, based on all 2 weather stations in Slovenia , was recorded in 2011 with an average temperature of 21.1 °C. This average temperature will normally be measured every 4 to 6 hours, thus also including the nights. Normally, this value is 19.5 degrees Celsius. The average maximum daily temperature at that time was 27.5 °C.

The coldest day in these 47 years was reported by the weather station Ljubljana Bezigrad. Here the temperature dropped to -16.2 °C in January 2003. Ljubljana Bezigrad lies at an altitude of 298 meters above sea level. The coldest winter (January to March) was in 1985 with an average temperature of -1.1 °C. In Slovenia, it is usual to have about 4.3 degrees more at 3.2 °C for this three-month period.




Long-term development of temperatures from 1991 - 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 1 measuring points in order to have actually comparable data over as long a period as possible.

In the years 1991 to 2021 there were only these 1 weather stations in the whole country, which reported continuous temperature values (Ljubljana Bezigrad). 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 2015 with 24.4 °C. January 2017 was the coldest month with an average temperature of -3.2 °C.

The average annual temperature was about 10.8 °C in the years after 1991 and about 12.1 °C in the last years before 2021. So in less than 31 years it has increased by about 1.3 °C. This trend only applies to the selected 1 weather stations in Slovenia. A considerably more comprehensive evaluation of the global warming has been provided separately.

Long-term development of temperatures in Slovenia

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 2 stations in Slovenia itself.In 10 cases, neighboring but nearby weather stations were also used to obtain more accurate values.
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