Portorož Water Temperature & Swim Forecast
Slovenia's flagship resort beach.
Live conditions loading.
Location
Portorož on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Check live temperature
Live water temperature is loading — refresh in a moment for a precise recommendation.
Recommendation tuned for Portorož's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Portorož swimming conditions summary
- Water temperature
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- Water feels
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- Swimmable today
- Loading live reading
- Swim conditions score
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- Wetsuit needed
- Check live temperature
- Air temperature
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- Waves
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- Wind
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- UV index
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- Warmest months to swim
- June, July, August
Live water temperature is loading — refresh in a moment for a precise recommendation. Live marine data updated hourly from Open-Meteo Marine.
Frequently asked questions
Can I swim at Portorož right now?
Live data is loading. Use the 7-day forecast above to plan your swim — conditions above 22°C are comfortable for most swimmers.
What will the sea temperature be at Portorož next week?
Based on long-term August averages and the latest marine model, expect the sea around Portorož to sit close to 26.0°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.
When is the best month to swim at Portorož?
June – July – August are typically the warmest months to swim at Portorož, with sea temperatures at their seasonal peak.
Can I swim at Portorož today?
Live data is loading. In summer, this beach typically offers comfortable swimming conditions.
- • Located in Slovenian Coast, Slovenia (Adriatic Sea).
- • Family friendly with calm, accessible water.
- • Live data refreshed hourly from Open-Meteo Marine.
Monthly sea temperature averages
Tap any month to see what to expect — based on regional climatology.
Best time to swim in Portorož
The sea in Portorož peaks in August, when the water averages around 26°C.
The main swimming season runs from June – October, when surface temperatures stay comfortable for extended sessions.
On average, 5 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like May and November are noticeably cooler but often quieter, with fewer crowds and steadier weather.
Outside peak season the water drops toward 15°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically February at around 12°C, when cold-water swimmers dominate the coast.
Portorož sea temperature history
Long-term climatology for Portorož shows an annual mean sea temperature of 18°C, ranging from 12°C in winter to 26°C at the summer peak.
The seasonal swing is roughly 14°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Portorož, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Portorož sea temperature: frequently asked questions
What is the warmest month to swim in Portorož?
August is the warmest month in Portorož, when the sea averages about 26°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Portorož?
The coldest month in Portorož is typically February, when the water averages around 12°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Portorož without a wetsuit?
The main swimming season in Portorož runs from June – October — about 5 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Portorož?
Outside peak summer the water in Portorož drops toward 15°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Portorož?
The long-term annual mean sea temperature in Portorož is about 18°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Portorož?
The live reading at the top of this page shows the current sea temperature in Portorož, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
Best swim months: Jun – Jul – Aug – Sep – Oct
| Month | Sea | Comfort |
|---|---|---|
| Jan | 13°C | Cold |
| Feb | 12°C | Cold |
| Mar | 13°C | Cold |
| Apr | 15°C | Bracing |
| May | 19°C | Pleasant |
| Jun | 23°C | Warm |
| Jul | 25°C | Warm |
| Aug ⭐ | 26°C | Hot |
| Sep | 23°C | Warm |
| Oct | 20°C | Pleasant |
| Nov | 17°C | Bracing |
| Dec | 14°C | Bracing |
Nearby beaches
The closest coastline, with live water temperatures.