Karlovac — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Karlovac, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Karlovac today is 19.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 |
|---|---|---|---|
| SEP 13 | 20.3°C | 16.9°C | |
| SEP 14 | 19.8°C | 16.9°C | |
| SEP 15 | 19.4°C | 16.9°C | |
| SEP 16 | 18.6°C | 16.9°C | |
| SEP 17 | 18.8°C | 16.9°C | |
| SEP 18 | 19.6°C | 16.9°C | |
| SEP 19 | 19.1°C | 16.9°C | |
| SEP 20 | 19.3°C | 16.9°C | |
| SEP 21 | 16.9°C | 19.2°C | |
| SEP 22 | 16.9°C | 19.1°C | |
| SEP 23 | 16.9°C | 18.9°C | |
| SEP 24 | 16.9°C | 18.8°C | |
| SEP 25 | 16.9°C | 18.7°C | |
| SEP 26 | 16.9°C | 18.6°C | |
| SEP 27 | 16.9°C | 18.5°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 | 4°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 | 20°C | 26°C |
| September | 12°C | 17°C | 22°C |
| October | 10°C | 14°C | 17°C |
| November | 6°C | 10°C | 13°C |
| December | 4°C | 8°C | 11°C |
Karlovac: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
In Karlovac, the Kupa River is one of the main natural attractions of the city, flowing gently through the urban area and providing accessible spots for recreation. During spring, the water is still relatively cool, typically around 12–16 °C, while in summer months, especially in July and August, shallow and calm stretches can warm up to 20–24 °C. These temperatures make the river suitable for refreshing dips and occasional swimming, though it remains cooler than many lowland lakes.
Swimming in the Kupa at Karlovac is popular among locals, particularly in designated and calmer areas where the current is gentle. Families and visitors often use the riverbanks for short swims, sunbathing, and picnics during warm days. The combination of natural beauty and urban accessibility makes it a convenient place for a summer break without traveling far from the city.