Piran — Water Temperature, Sea Conditions & Trends

Water Temperature: Daily Trends, Historical Records, and Forecast

✅ As of today, the minimum water temperature is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating.

It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.

Water Temperature Chart Over the Last 30 Days

Water temperature in Piran has risen over the last week and month. Currently, the sea water at this location is slightly warmer than average for this day in previous years.

According to our forecast, Water temperature in Piran will be 20.3°C in the next 7 days. See the table below for daily data for the upcoming week.

Table of Daily Sea Temperature Data

Annual Water Temperature Overview by Month

Monthly Water Temp Ranges

30°C

25°C

20°C

15°C

10°c

5°C

0°C

Annual Water Temperature Trend

Piran is a compact coastal town on Slovenia’s short Adriatic coastline, located on the Gulf of Trieste. The sea around Piran follows the northern Adriatic seasonal pattern: winter months typically see water temperatures around 11–14 °C, spring brings a gradual rise to roughly 13–18 °C, summer is the warmest period with surface temperatures commonly between 22–26 °C, and autumn cools back to about 16–21 °C. Local microclimates and shallow bays can cause modest variations day to day, but these ranges give a reliable sense of what to expect when planning visits throughout the year.