Slovenia in December: where is it warmest?
In December, Koper is the warmest place with 9 °C by day, Bled the coolest with 4 °C. 0 of 10 destinations have good holiday weather.
All destinations in December, warmest first
Long-term averages for the month: daytime high, sea, sunshine and rainy days.
Slovenia in December: quick answers
Slovenia in December: where is it warmest?
The warmest places in December are Koper (9 °C), Piran (9 °C) and Izola (9 °C).
Slovenia in December: where is the sea warmest?
The sea is warmest at Koper (13 °C), Piran (13 °C) and Izola (13 °C).
Slovenia in December: where is the weather best?
The best holiday weather in December – warm, sunny and dry – is in Maribor, Ptuj and Ljubljana.
Slovenia month by month
Slovenia: weather & best time to visit
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences