Portoroz weather in January 2025

Expect 7°C daytime maximum temperatures in the shade with on average 3 hours of sunshine per day in Portoroz in January. Check more long-term weather averages for Portoroz in January before you book your next holiday to Slovenia in 2025/2026.

  • 7°C maximum daytime temperature in January in Portoroz7
    7°C max day temperature
  • 3 hours of sunshine per day
  • 12 days with some rainfall in January in Portoroz12
    12 days with some rainfall
  • 1°C minimum night-time temperature in January in Portoroz1
    1°C min night temperature
  • 9 hours of daylight per day in January in Portoroz9
    9 hours of daylight per day
  • No heat & humidity in January in Portoroz0
    No heat & humidity
  • 86 mm monthly rainfall in January in Portoroz86
    86 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Portoroz1
    1 (Low) UV index
  • 10°C sea temperature in January in Portoroz10
    10°C sea temperature

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The January 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 / mm)  |  Imperial (°F / inches)

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More about Slovenia

How cold is it in Portoroz in January?

Daytime temperatures usually reach 7°C in Portoroz in January, falling to 1°C at night.

How sunny is it in Portoroz in January?

There are normally 3 hours of bright sunshine each day in Portoroz in January - that's 37% of daylight hours.

Is the sea cold around Portoroz in January?

The average sea temperature around Portoroz in January is 10°C.

Does it rain in Portoroz in January?

There are usually 12 days with some rain in Portoroz in January and the average monthly rainfall is 86mm.

Portoroz January sunrise & sunset times

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


Date Sunrise times Sunset times
Wednesday, 1st January 2025 07:46 16:33
Thursday, 16th January 2025 07:41 16:50
Friday, 31st January 2025 07:28 17:11

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