Portoroz weather in August 2025

Expect 27°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Portoroz in August. Check more long-term weather averages for Portoroz in August before you book your next holiday to Slovenia in 2025/2026.

  • 27°C maximum daytime temperature in August in Portoroz27
    27°C max day temperature
  • 8 hours of sunshine per day
  • 11 days with some rainfall in August in Portoroz11
    11 days with some rainfall
  • 17°C minimum night-time temperature in August in Portoroz17
    17°C min night temperature
  • 14 hours of daylight per day in August in Portoroz14
    14 hours of daylight per day
  • Low heat & humidity in August in PortorozL
    Low heat & humidity
  • 109 mm monthly rainfall in August in Portoroz109
    109 mm of monthly rainfall
  • UV (maximum) index 7 (High) in August in Portoroz7
    7 (High) UV index
  • 25°C sea temperature in August in Portoroz25
    25°C sea temperature

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The August 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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How hot is it in Portoroz in August?

Daytime temperatures usually reach 27°C in Portoroz in August with low heat and humidity, falling to 17°C at night.

How sunny is it in Portoroz in August?

There are normally 8 hours of bright sunshine each day in Portoroz in August - that's 60% of daylight hours.

How warm is the sea around Portoroz in August?

The average sea temperature around Portoroz in August is 25°C.

Does it rain in Portoroz in August?

There are usually 11 days with some rain in Portoroz in August and the average monthly rainfall is 109mm.

Portoroz August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:50 19:34
Saturday, 16th August 2025 05:08 19:11
Sunday, 31st August 2025 05:26 18:45

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