The island church on Lake Bled with the Julian Alps rising behind it in morning light
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Slovenia by campervan: weather and best time

When to tour Slovenia by campervan: temperatures, rainfall and the best season for each part of the country. What to know before you go.

Published 18 September 2026Last checked 18 September 2026

Weather

Weather

Slovenia runs two calendars at once. The Julian Alps are a June to September country and snowbound either side, with the high passes shut. The coast and the lower Karst work from April to October and are mild enough in winter to be worth a trip when the mountains are closed. Because the country is small, the two are a two-hour drive apart, so a bad week in one is a good week in the other.

Bare limestone crags and a tall rock pinnacle above a scrubby valley under grey cloud
The Karst. Wet autumns, mild winters, and the <em>burja</em> wind off the mountains

The year by region: how it feels, how warm, how wet

Julian Alps and TriglavRateče
2°68 mm
5°79 mm
9°89 mm
13°107 mm
18°122 mm
22°143 mm
24°161 mm
24°155 mm
19°178 mm
14°185 mm
7°189 mm
2°116 mm
Soča valley and the westNova Gorica
8°93 mm
10°89 mm
14°90 mm
18°97 mm
23°130 mm
27°135 mm
29°116 mm
30°114 mm
24°179 mm
19°166 mm
13°199 mm
9°142 mm
The KarstPostojna
4°89 mm
6°104 mm
10°96 mm
15°107 mm
19°124 mm
24°119 mm
26°95 mm
26°100 mm
20°161 mm
15°160 mm
10°172 mm
5°141 mm
The coastPortorož
9°54 mm
11°62 mm
14°56 mm
18°64 mm
23°74 mm
27°78 mm
29°59 mm
30°71 mm
25°122 mm
20°110 mm
15°122 mm
10°87 mm
Ljubljana and the centreLjubljana
4°67 mm
7°84 mm
12°83 mm
17°97 mm
22°114 mm
26°125 mm
28°122 mm
28°124 mm
22°160 mm
16°150 mm
10°138 mm
4°104 mm
Pohorje and the eastMaribor
4°33 mm
7°43 mm
12°49 mm
17°62 mm
21°97 mm
25°107 mm
27°103 mm
27°101 mm
21°113 mm
16°87 mm
10°82 mm
5°60 mm

BestWorkableToo hotCold or wetTop figure: average daily high. Below it: average rainfall for the month.

Rateče sits at 864 metres on a valley floor, so its row is the mildest reading the Julian Alps have to offer. Vršič at 1,611 metres and the plateaux above the valleys are several degrees colder and hold snow for months longer. Treat that row as the bottom of the mountains, not the mountains.