Portoroz weather in May 2025

Expect 22°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Portoroz in May. Check more long-term weather averages for Portoroz in May before you book your next holiday to Slovenia in 2025/2026.

  • 22°C maximum daytime temperature in May in Portoroz22
    22°C max day temperature
  • 7 hours of sunshine per day
  • 14 days with some rainfall in May in Portoroz14
    14 days with some rainfall
  • 12°C minimum night-time temperature in May in Portoroz12
    12°C min night temperature
  • 15 hours of daylight per day in May in Portoroz15
    15 hours of daylight per day
  • No heat & humidity in May in Portoroz0
    No heat & humidity
  • 98 mm monthly rainfall in May in Portoroz98
    98 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Portoroz7
    7 (High) UV index
  • 18°C sea temperature in May in Portoroz18
    18°C sea temperature

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The May 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 hot is it in Portoroz in May?

Daytime temperatures usually reach 22°C in Portoroz in May, falling to 12°C at night.

How sunny is it in Portoroz in May?

There are normally 7 hours of bright sunshine each day in Portoroz in May - that's 49% of daylight hours.

How warm is the sea around Portoroz in May?

The average sea temperature around Portoroz in May is 18°C.

Does it rain in Portoroz in May?

There are usually 14 days with some rain in Portoroz in May and the average monthly rainfall is 98mm.

Portoroz May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 04:54 19:13
Friday, 16th May 2025 04:34 19:31
Saturday, 31st May 2025 04:21 19:46

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