Portoroz weather in January 2025

Expect 45°F 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.

  • 45°F maximum daytime temperature in January in Portoroz45
    45°F max day temperature
  • 3 hours of sunshine per day
  • 12 days with some rainfall in January in Portoroz12
    12 days with some rainfall
  • 34°F minimum night-time temperature in January in Portoroz34
    34°F 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
  • 3.4 inches monthly rainfall in January in Portoroz3.4
    3.4 inches of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Portoroz1
    1 (Low) UV index
  • 50°F sea temperature in January in Portoroz50
    50°F 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)  |  Imperial (°F)

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More about Slovenia

How cold is it in Portoroz in January?

Daytime temperatures usually reach 45°F in Portoroz in January, falling to 34°F 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.

How warm is the sea around Portoroz in January?

The average sea temperature around Portoroz in January is 50°F.

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 3.4 inches.

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.

JanFebMarAprMayJunJulAugSepOctNovDec

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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