Portoroz weather in December 2025

Expect daytime maximum temperatures of 46°F in Portoroz, Slovenia in December based on long-term weather averages. There are 3 hours of sunshine per day on average with 12 days with some rainfall and typically 3.9 inches of rainfall in the month.

  • 46°F maximum daytime temperature in December in Portoroz46
    46°F max day temperature
  • 3 hours of sunshine per day
  • 12 days with some rainfall in December in Portoroz12
    12 days with some rainfall
  • 36°F minimum night-time temperature in December in Portoroz36
    36°F min night temperature
  • 9 hours of daylight per day in December in Portoroz9
    9 hours of daylight per day
  • No heat & humidity in December in Portoroz0
    No heat & humidity
  • 3.9 inches monthly rainfall in December in Portoroz3.9
    3.9 inches of monthly rainfall
  • UV (maximum) index 1 (Low) in December in Portoroz1
    1 (Low) UV index
  • 54°F sea temperature in December in Portoroz54
    54°F sea temperature

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The December weather guide for Slovenia (Portoroz) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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More about Slovenia

How warm is it in Portoroz in December?

Daytime temperatures usually reach 46°F in Portoroz in December, falling to 36°F at night.

How sunny is it in Portoroz in December?

There are normally 3 hours of bright sunshine each day in Portoroz in December - that's 34% of daylight hours.

How warm is the sea around Portoroz in December?

The average sea temperature around Portoroz in December is 54°F.

Does it rain in Portoroz in December?

There are usually 12 days with some rain in Portoroz in December and the average monthly rainfall is 3.9 inches.

Portoroz December sunrise & sunset times

Browse the sunrise and sunset times for Portoroz in December 2025. Select a month to view Portoroz sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 07:25 16:24
Tuesday, 16th December 2025 07:40 16:23
Wednesday, 31st December 2025 07:46 16:32

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