Piran — Water Temperature, Sea Conditions & Trends

Water Temperature: Daily Trends, Historical Records, and Forecast

✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays.

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 rose over the last 30 days but fell over the last week. Currently, the sea water temperature at this location matches the average for this day in previous years.

According to our forecast, Water temperature in Piran will be 25.5°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.