Piran Sea Temperature
Slovenia · Forecast updated Jul 15, 2026, 06:24 UTC · refresh delayed
Current Sea Temperature
27.4°C
81.3°F
Warm water
Versus this month's average
Close to average
The July average in our archive is 27.2°C (80.9°F).
Recent trend
Warming by 0.9°C
Seven-day average: 27.4°C, versus 26.5°C in the prior seven days.
What to wear
Warm water
Most people are comfortable in swimwear or a light rash guard.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not mean the sea is safe.
Sea Surface Temperature Over the Year
In the data collected for Piran, monthly averages range from about 24.6°C (76.3°F) in June to 27.2°C (80.9°F) in July.
Over the past 30 days, the average sea temperature in Piran has been 26.6°C.
Monthly Water Temperature Averages
| Month | Min | Average | Max |
|---|---|---|---|
| June | 21.5°C / 70.7°F | 24.6°C / 76.3°F | 28.5°C / 83.3°F |
| July | 25.5°C / 77.9°F | 27.2°C / 80.9°F | 28.9°C / 84.0°F |
Profile calculated from 1071 hourly forecast records across 2 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Piran
Adriatic town with the Strunjan nature reserve's clear, sheltered shallows.
- Area
- Istria
Piran Water Temperature — Common Questions
What is the sea temperature in Piran today?
The current sea surface temperature in Piran is 27.4°C. Over the last 30 days, the average has been 26.6°C.
When is the water warmest in Piran?
The warmest monthly average in the Piran archive is July, at around 27.2°C (80.9°F).
When is the water coldest in Piran?
The coldest monthly average in the archive is June, at around 24.6°C (76.3°F).
Can you swim in Piran today?
Yes — at 27.4°C the water is warm enough for comfortable swimming and snorkeling.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Piran.
View Snorkel Forecast →