Kupa River — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the Kupa River, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the Kupa River today is 20.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 23 | 19.2°C | 18.0°C | |
| JUN 24 | 20.1°C | 18.0°C | |
| JUN 25 | 20.0°C | 18.0°C | |
| JUN 26 | 20.2°C | 18.0°C | |
| JUN 27 | 20.2°C | 18.0°C | |
| JUN 28 | 20.2°C | 18.0°C | |
| JUN 29 | 20.3°C | 18.0°C | |
| JUN 30 | 20.3°C | 18.0°C | |
| JUL 1 | 19.0°C | 20.7°C | |
| JUL 2 | 19.0°C | 20.6°C | |
| JUL 3 | 19.0°C | 20.5°C | |
| JUL 4 | 19.0°C | 20.4°C | |
| JUL 5 | 19.0°C | 20.4°C | |
| JUL 6 | 19.0°C | 20.3°C | |
| JUL 7 | 19.0°C | 20.2°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.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 3°C | 8°C | 11°C |
| February | 4°C | 8°C | 10°C |
| March | 7°C | 10°C | 13°C |
| April | 8°C | 12°C | 15°C |
| May | 9°C | 14°C | 18°C |
| June | 13°C | 18°C | 22°C |
| July | 15°C | 19°C | 24°C |
| August | 15°C | 19°C | 24°C |
| September | 12°C | 17°C | 21°C |
| October | 10°C | 14°C | 17°C |
| November | 6°C | 10°C | 13°C |
| December | 4°C | 8°C | 11°C |
Kupa River: Water Temperature by Location
Kupa River: Weather Forecast
July 1
July 2
July 3
July 4
Location & Local Information
The Kupa River, known as Kolpa in Slovenia, flows along the southern border of the country and is one of the warmest rivers suitable for swimming. During the summer months, the water temperature in Slovenia can reach 22–26°C, especially in slower, shallower sections. In spring and autumn, the river is cooler, usually around 14–18°C, while in winter temperatures drop to 4–6°C in most areas.
Swimming in the Kolpa is very popular, particularly in summer. The river has many calm, shallow spots with gentle banks, making it ideal for families and casual swimmers. Canoeing, kayaking, and other water sports are also common, thanks to the river's generally mild current and clear water.
Outside the warmest months, swimming becomes less frequent due to lower temperatures, but the river remains attractive for walking along its banks, picnicking, and enjoying nature. Even a short summer dip provides a refreshing break from the heat.