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Climate in Slovenia


Average weather, temperature, rainfall, sunshine

Flag - Slovenia

Map - Slovenia

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In Slovenia, there is a clear separation between the western flat area, stretched from Nova Gorica to northern Istria, which has a quite mild climate, and the interior, which has a moderately continental climate (in the hills, the valley bottoms and the eastern plain) or a cold mountain climate (in the mountains).
Precipitation (rain or snow) is abundant in the western part of the country, where it ranges between 1,000 and 1,500 millimeters (40 and 60 inches) per year in plains and hills, while it exceeds 2,000 mm (80 in) in the mountains, and even 3,000 mm (120 in) on the most exposed slopes. Only in plains and hills of the far east, precipitation is less abundant, and decreases below 900 mm (35.5 in).

The climate in detail


  • The western plain - Portoroz
  • Inland areas - Ljubljana
  • Mountains - Kranjska Gora, Kredarica
  • When to go
  • What to pack
  • Climate data

The western plain



About 30 kilometers (18 miles) away from the coast, there is a mountain range that separates the interior from the sea, so the western plains of Slovenia that are influenced by the sea are not vast.
This flat area close to the coast has a climate that can be described as transitional Mediterranean.
In fact, winter is quite mild in cities such as Portoroz, Piran, Izola, Koper, though you cannot fully define it as Mediterranean, since the average temperature in January is around 5/6 °C (41/43 °F).
In addition, this area is exposed to a fearful wind: the temperature undergoes sudden drops when the Bora makes its appearance, that is, a cold and furious wind which blows more often in the cold half of the year and which can be accompanied by clear skies (light Bora) or more rarely by cloudy skies, with rain or snow (dark Bora).
Since the Bora comes from the plains of Eastern Europe, it is usually dry, so, snow in this area is rare and usually not abundant.

Piran

Summer in the western plain is warm or even hot, averaging around 23 °C (73 °F) in July and August, though it's tempered by the breeze.
The rains are frequent throughout the year, with a maximum in autumn (September to November), a relative minimum in winter, and an increase between late spring and summer.
This is not to say that summer is a bad season, but you have to take into account some thunderstorms in the afternoon, and even a few days when Atlantic disturbances manage to move over the country, maybe accompanied with some cool gusts of Bora.

Portoroz

Climate chart - Portoroz
In Portoroz, located on the coast of the northern Adriatic Sea, on the Gulf of Trieste, the average temperature ranges from around 5.5 °C (42 °F) in January to around 23.5 °C (74 °F) in July and August.
Rainfall is fairly abundant, around 950 millimeters (37.5 inches) per year, and it is well distributed throughout the year, in fact, there can be some rain even in summer, often in the form of thunderstorms. However, the rainiest season is autumn.
In Portoroz and along the Adriatic Coast, the sun does not shine very often in winter, while it frequently shines in summer.
The sea temperature is high enough for swimming in July and August, but all in all, even in September.

In the cities that are not located right on the coast, the winter is a bit colder, as is the case of Nova Gorica and Ajdovscina, but the average is still above freezing, around 4/5 °C (39/41 °F) in January.

Inland areas



As soon as you move towards the interior, you will find some elevations, which are able to reduce the mild influence of the Adriatic Sea. Already in Postojna, located in the Karst Plateau, at 530 meters (1,700 feet) above sea level, winter is cold and snowy, while summer can be hot during the day, but nights remain cool. Rainfall is abundant throughout the year, with a relative decrease only in January, February, and July; in autumn, it can sometimes be torrential.

Ljubljana

Climate chart - Ljubljana
In Ljubljana, at 300 meters (1,000 feet) above sea level, the monthly average temperature ranges from 1 °C (34 °F) in January to 22 °C (71.5 °F) in July. In winter, snow often falls, while in summer, there is a moderate amount of afternoon thunderstorms, although the sun shines quite often. In winter, there are frequent fogs when the weather is stable, while cold waves from Russia can bring intense frosts; in summer, there can be short heat waves, with peaks of 35 °C (95 °F).
Rainfall is abundant here as well, about 1,370 mm (54 in) per year, in fact, it is one of the rainiest capitals in Europe.
The sun in Ljubljana is rarely seen in winter, while in summer, it shines quite often, though not as often as along the coast.

Ljubljana

Across the central and eastern part of Slovenia, the climate is similar to that of Ljubljana, and the differences are mainly due to the altitude.
Going to the east, however, annual precipitation gradually decreases: in Maribor, it drops to 895 mm (35 in), mainly because autumn and winter are relatively less rainy, while summer equally receives its load of thunderstorms. This applies to the entire eastern area, from Maribor to the north-eastern flat area, on the border with Austria and Hungary.

Mountains



In high mountains, the climate is naturally colder. Snowfalls are especially abundant in the mountains of western Slovenia, on both the northern Alpine sector and in the massif to the south, which, not coincidentally, is called "snowy mountain" (Snežnik).

Kranjska Gora

Climate chart - Kranjska Gora
In Kranjska Gora, a ski resort near the border with Austria, 800 meters (2,600 feet) above sea level, , the average temperature ranges from around -2.5 °C (27.5 °F) in January to around 17.5 °C (63.5 °F) in July and August.
On average, 1,450 mm (58 in) of rain or snow fall per year, and even more in the mountains that surround it. Here, strong afternoon thunderstorms can occur in summer, as well as heavy rains in autumn, especially in October.

South of Kranjska Gora, we find mountains exceeding 2,500 meters (8,200 feet). The highest mountain in Slovenia and the Julian Alps is Triglav (Tricorno), 2,864 meters (9,396 feet) high. In the area, there is also a glacier, now in retreat due to global warming.

Kredarica

Climate chart - Kredarica
Near a peak in the vicinity, mount Kredarica, there is a meteorologic station at 2,500 meters (8,200 ft), at the Triglav Lodge. The snow reaches its maximum height in April (3.2 meters or 10.5 feet), in June it is still a meter (3.3 ft) high on average, while it has completely melted by August. Record low and high temperature are respectively -28 °C (-18.5 °F) and 21.5 °C (70.5 °F).

Triglav Lodge

When to go



The short coastline of Slovenia is good for a beach holiday in summer, especially in July and August, even though there can be some cool and rainy days, or some afternoon thunderstorms.
You can visit the interior from June to September, bearing in mind, however, that the rains may sometimes be heavy even in summer in the western areas, such as in Ljubljana or Postunia. In July and August, every so often, periods of intense heat may occur, so if you don't like the heat, you may prefer June and September.
In the mountain resorts, there is almost always enough snow. In February, the days are longer than in the Christmas period, so it can preferable for a ski holiday.

What to pack



In winter: in the interior, bring warm clothes, such as a sweater, a down jacket, a scarf, gloves, and an umbrella. On the coast, bring warm clothes, a jacket, a raincoat or umbrella, but also a hat, a scarf, and gloves for the days with Bora.

In summer: bring light clothes, T-shirts and shorts, but also long pants, a jacket and a sweatshirt for the evening or for cooler days; a raincoat or umbrella. In the mountains, bring hiking shoes, sunscreen and sunglasses.

Climate data - Slovenia


Temperatures: °C, Precipitation: mm
Celje (240 meters)
Celje, location on the map
Celje, location on the map
JanFebMarAprMayJunJulAugSepOctNovDec
Min temp.-4-40491314141062-3
Max temp.571217222628272216105
Precip.456060759512012511513011510080
Prec. days6679101010910888
Humidity82%79%75%72%74%76%76%79%82%83%83%83%
Day length911041201361501571531411251099487
Sun hours345678886422

Koper
Koper, location on the map
Koper, location on the map
JanFebMarAprMayJunJulAugSepOctNovDec
Min temp.3471014182020161284
Max temp.91014182327303025201510
Precip.506055658090707012512012085
Prec. days666787668898

Kranjska Gora (800 meters)
Kranjska Gora, location on the map
Kranjska Gora, location on the map
JanFebMarAprMayJunJulAugSepOctNovDec
Min temp.-7-6-3159111173-1-6
Max temp.2591318222424191472
Precip.658085105120130155160165180185100
Prec. days668111211111199108
Day length911041201361511581541411251089486
Sun hours345667886422

Kredarica (2.500 meters)
Kredarica, location on the map
Kredarica, location on the map
JanFebMarAprMayJunJulAugSepOctNovDec
Min temp.-10-11-8-5-13551-2-5-9
Max temp.-4-5-3-1381010640-4
Precip.9095120140160205220205235235215130
Prec. days9911141515141312121210
Sun hours445556665434

Ljubljana (300 meters)
Ljubljana, location on the map
Ljubljana, location on the map
JanFebMarAprMayJunJulAugSepOctNovDec
Min temp.-2-126111416161284-1
Max temp.471217222628282216104
Precip.658585100115125120130155150140100
Prec. days7781011109999108
Humidity87%80%73%71%72%72%72%75%81%85%89%91%
Day length911041201361501571531411251099487
Sun hours245688996422

Maribor (270 meters)
Maribor, location on the map
Maribor, location on the map
JanFebMarAprMayJunJulAugSepOctNovDec
Min temp.-3-216101416151173-2
Max temp.471217212527272116105
Precip.3045506010095100110105858055
Prec. days56681110989786
Humidity82%75%68%65%67%67%66%70%76%80%83%85%
Day length911041201361511581541411251089486
Sun hours345689986532

Murska Sobota
Murska Sobota, location on the map
Murska Sobota, location on the map
JanFebMarAprMayJunJulAugSepOctNovDec
Min temp.-4-315101315151062-3
Max temp.471217222627272216104
Precip.3040405085959595100706545
Prec. days55671010988777
Sun hours245789986422

Nova Gorica
Nova Gorica, location on the map
Nova Gorica, location on the map
JanFebMarAprMayJunJulAugSepOctNovDec
Min temp.-10361115161612850
Max temp.8101418232730302419149
Precip.80808590115110100105165150170125
Prec. days767910987910108
Humidity72%69%66%68%69%70%68%68%72%74%73%73%
Day length911041201361501571531401251099487
Sun hours3566891097533

Novo Mesto
Novo Mesto, location on the map
Novo Mesto, location on the map
JanFebMarAprMayJunJulAugSepOctNovDec
Min temp.-3-215101415151173-2
Max temp.571217222628272216105
Precip.5570608510510510011013512011080
Prec. days7779101098109109
Sun hours345679996422

Portoroz
Portoroz, location on the map
Portoroz, location on the map
JanFebMarAprMayJunJulAugSepOctNovDec
Min temp.114812161717141072
Max temp.91014182327292925201410
Precip.506055657575607012010512580
Prec. days666886568897
Humidity80%75%70%70%70%70%65%70%75%80%80%80%
Day length921041201361491561521401251099588
Sun hours356781011107533
Sea temp121011141822252623201614

Postojna (530 meters)
Postojna, location on the map
Postojna, location on the map
JanFebMarAprMayJunJulAugSepOctNovDec
Min temp.-3-30481113131063-2
Max temp.46101520242626201595
Precip.90105100115130120100110160165185140
Prec. days8881111108810111210
Humidity83%80%78%77%77%79%77%79%82%83%84%84%
Day length911041201361501571531401251099587
Sun hours345678996433

Slovenj Gradec (445 meters)
Slovenj Gradec, location on the map
Slovenj Gradec, location on the map
JanFebMarAprMayJunJulAugSepOctNovDec
Min temp.-6-5-138121313951-4
Max temp.361116202426262015103
Precip.4050607010013013512513010510065
Prec. days6679111110109897
Sun hours345678886422



See also the temperatures month by month

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 See also (cities or regions):
 Celje
 Kranjska Gora
 Ljubljana
 Maribor
 Nova Gorica
 Portoroz
 Postojna

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