Piran — Water Temperature, Sea Conditions & Trends
This page provides clear and up-to-date information about water temperature for Piran (Slovenia). It includes the current water temperature, daily data for the last month presented in a simple chart, and a 7-day forecast. The page also compares today’s value with typical averages for this period, shows usual monthly ranges during the year, and lists nearby beaches with short descriptions. Local weather for the next few days and general details about Piran help you plan your visit and choose the best time for swimming.
Current Water Temperature
Water temperature in Piran in the Adriatic Sea today is 24°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health.
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 today is lower than both a week ago and a month ago. 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 21.9°C in the next 7 days. See the table below for daily data for the upcoming week.
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| SEP 19 | 25.3°C | 23.8°C | |
| SEP 20 | 25.0°C | 23.8°C | |
| SEP 21 | 25.0°C | 24.0°C | |
| SEP 22 | 24.8°C | 23.5°C | |
| SEP 23 | 24.7°C | 23.8°C | |
| SEP 24 | 24.7°C | 23.8°C | |
| SEP 25 | 24.5°C | 23.3°C | |
| SEP 26 | 24.0°C | 23.0°C | |
| SEP 27 | 23.5°C | 22.8°C | 23.5°C |
| SEP 28 | 21.5°C | 23.3°C | |
| SEP 29 | 22.0°C | 23.0°C | |
| SEP 30 | 21.8°C | 22.8°C | |
| OCT 1 | 22.5°C | 22.6°C | |
| OCT 2 | 22.0°C | 22.4°C | |
| OCT 3 | 21.5°C | 22.1°C | |
| OCT 4 | 21.3°C | 21.9°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Water temperature data for this location is gathered from various sources, including buoys and satellite sea and ocean surface maps provided by the NOAA agency. We also incorporate data from local authorities in each specific location worldwide to ensure more accurate temperature readings.
Annual Water Temperature Overview by Month
Monthly Water Temp Ranges
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.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 6°C | 10°C | 14°C |
| February | 8°C | 10°C | 12°C |
| March | 8°C | 11°C | 14°C |
| April | 10°C | 13°C | 17°C |
| May | 14°C | 18°C | 23°C |
| June | 18°C | 23°C | 27°C |
| July | 22°C | 25°C | 28°C |
| August | 22°C | 26°C | 29°C |
| September | 19°C | 24°C | 28°C |
| October | 13°C | 19°C | 23°C |
| November | 14°C | 17°C | 20°C |
| December | 10°C | 14°C | 16°C |
* Click on a month to view detailed water temperature data.
Piran: Weather Forecast
September 28
September 29
September 30
October 1
October 2
Location, Beaches & Local Information
Nearby Beaches & Facilities
Preseren Beach
Beach Tartini
Tartini Beach
Fornace
Fornace Beach
Fiesa Beach
Beach Fiesa
Bernardin Beach
Pacug Beach
Swimming Conditions
Swimming around Piran is popular in the summer when the sea is warm enough for comfortable bathing; June through September are the most frequented months when water temperatures exceed 20 °C. The coastline here offers a mix of concrete platforms, pebbled stretches and small rocky coves rather than long sandy beaches, with public access points, hotel beaches and nearby resorts like Portorož and Strunjan providing additional facilities. Calm waters in the sheltered gulf are generally suited to family swimming, snorkeling and short boat excursions, though visitors should be mindful of sudden weather changes and follow local safety advice. For those seeking a traditional beach holiday, Piran’s historic setting combined with accessible swimming spots makes it a compact and pleasant option during the warmer months.