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When to travel to Slovenia: weather and seasons
The Slovenian climate is continental in the mountains and mediterranean on the sea. From its very short coastline, Slovenia's climate changes from a temperate sub-mediterranean to a chillier alpine climate in the north. In the summer it can be very hot at the coast and quite cold in the mountains, so we advise you to check the weather forecast when planning your visit! You're advised to bring heavy woolen clothes if you come in winter and raincoat is a must in the summer season.
Slovenia can really be divided into three climatic zones.
The Adriatic coastal area of Slovenia has a mediterranean climate with warm to hot and dry summers, mild winters, lots of sunshine and an annual rainfall of 1100-1300 mm. The coast has moderate temperatures all year round (22-24°C in summer, 2-4°C in winter), and average high temperatures usually stay below 30°C (86°F). The coast-side winters however can be quite a challenge: despite mostly mild conditions, the cold northeastern bora winds and heavy rainfall can put off even the hardiest visitor between December and March.
Istria and the area near Trieste demonstrate a transition from the Mediterranean climate of the Dalmatian coast to a moderate continental climate. Owing to its position on the Adriatic, the Primorska region has a warmer climate with higher average temperatures in every season, whereas the sea influence also extends as far as Tolmin along the Soca Valley and up to the Karst plateaus in the hinterland.
Slovenia's inland areas have the typical central European climate, with cold winters, during which temperatures plummet to barely above zero (32°F).
The mountainous area of the northwest has an alpine climate with moderate summer temperatures (average 12-23°C) but cold winters (0°C or below). This Alpine region has over 2500 mm of precipitation annually, more than half falling as snow. In summer, the beautiful alpine valley of Bohinj comes alive with sports and activities. In summer the lakes are heated up to the point where they are warm enough for swimming, and in winter, when the temperatures fall below zero, the icy lake surfaces make excellent skating rinks.
Central and northern Slovenia have a continental, "cool summer" climate, The central part enjoys a temperate sub-alpine climate with quite hot summers (average temperatures are around 18-20°C), good sunshine but an average of 120 rainy days each year (annual precipitation 1300-1600 mm).
The eastern third of the Slovenia (mainly Subpannonia) also falls into the continental category but has warm summers and a growing season almost as long as Istria's. This eastern part of Slovenia is characterised by a moderate continental climate with average air temperatures from 8-10 °C and an annual temperature around 23 °C.
Late spring or early autumn are good times for climbing and hiking, avoiding the extremes of temperatures and rain. During late spring, summer and early autumn (April to mid-October), daytime temperatures mostly remain in the high 20°Cs (low 80°Fs), but significant downpours can come at just about any time during this period. It becomes colder at the end of October.
Slovenia's pleasant capital, Ljubljana, has warm and breezy climate in the warmer months.However, in winter the there is often heavy fog formation and the climate becomes very cold. Summer is better!
Climate in Slovenia
Fahrenheit and centigrade, inches and millimetres, average values.
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Useful facts, dates and links to help you plan your tour of Slovenia