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River water temperatures
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River water temperatures on   07 May 2026 / 08 May 2026

 River gauge  River 22 01 04 07 10 13 16 19
 Donji Miholjac  Drava 18.04 17.85 17.75 17.56 17.72 18.26 18.78 18.69
 Batina  Dunav 18.4 18.4 18.3 18.1 18.1 18.5 18.8 18.8
 Vukovar  Dunav 18.9 18.8 18.7 18.6 18.7 18.9 19.1 19.1
 Ilok most  Dunav 19.1 18.9 18.8 18.7 18.9 19.6 20.2 20.1
 Bregana-remont  Bregana 11.9 11.8 11.1 10.5 10.5 11.0 11.7 12.3
 Samobor  Gradna 14.2 12.9 11.8 11.0 11.5 14.3 17.3 17.3
 Bračak  Krapina 15.5 15.5 15.3 14.8 14.5 14.5 14.8 15.4
 Luketići  Korana 13.4 13.1 12.7 12.3 12.5 13.2 13.9 14.1
 Jarče Polje  Donja Dobra 13.1 13.2 12.8 12.4 12.6 12.8 13.2 13.7
 Zamost 2  Čabranka 10.4 9.9 9.4 9.1 9.2 10.5 12.7 13.0
 Kozjak most  Kozjak jezero 13.3 13.13 13.02 12.94 13.0 13.34 13.34 13.16
 Portonski most  Mirna 13.2 13.2 13.1 13.1 13.1 13.1 13.1 13.2
 Izvor Rječine  Rječina 8.0 8.0 7.9 7.9 7.9 7.9 7.8 7.8
 Prevjes  Zrmanja 10.3 10.2 10.0 9.8 10.0 10.9 11.5 11.5
 Krupa  Krupa 11.1 11.0 11.0 11.0 11.0 11.2 11.2 11.2
 Roški slap  Krka 14.3 14.1 13.9 13.9 14.0 14.4 14.3 14.1
 Nacionalni park  Krka 16.6 16.5 16.4 16.2 16.2 16.2 16.2 16.3
 Dusina  Matica Vrgorska 14.2 14.2 14.0 13.9 13.9 14.0 14.2 14.3
 Metković  Neretva 13.0 13.1 13.1 12.8 12.7 12.7 12.8 13.0

River water temperatures on   08 May 2026

 River gauge  River 07 10 13 16 19
 Donji Miholjac  Drava 17.56 17.72 18.26 18.78 18.69
 Batina  Dunav 18.1 18.1 18.5 18.8 18.8
 Vukovar  Dunav 18.6 18.7 18.9 19.1 19.1
 Ilok most  Dunav 18.7 18.9 19.6 20.2 20.1
 Bregana-remont  Bregana 10.5 10.5 11.0 11.7 12.3
 Samobor  Gradna 11.0 11.5 14.3 17.3 17.3
 Bračak  Krapina 14.8 14.5 14.5 14.8 15.4
 Luketići  Korana 12.3 12.5 13.2 13.9 14.1
 Jarče Polje  Donja Dobra 12.4 12.6 12.8 13.2 13.7
 Zamost 2  Čabranka 9.1 9.2 10.5 12.7 13.0
 Kozjak most  Kozjak jezero 12.94 13.0 13.34 13.34 13.16
 Portonski most  Mirna 13.1 13.1 13.1 13.1 13.2
 Izvor Rječine  Rječina 7.9 7.9 7.9 7.8 7.8
 Prevjes  Zrmanja 9.8 10.0 10.9 11.5 11.5
 Krupa  Krupa 11.0 11.0 11.2 11.2 11.2
 Roški slap  Krka 13.9 14.0 14.4 14.3 14.1
 Nacionalni park  Krka 16.2 16.2 16.2 16.2 16.3
 Dusina  Matica Vrgorska 13.9 13.9 14.0 14.2 14.3
 Metković  Neretva 12.8 12.7 12.7 12.8 13.0
Measurements of river water temperatures

River temperatures are an important indicator of the state of the environment, as water, due to its good thermal conductivity, is a direct indicator of surface and underground temperature of the entire upstream basin, but also beyond.

There are eight river temperature values shown in the table with a three-hour frequency. The displayed values were measured at the specified hour on 20 hydrological stations in different parts of Croatia. Modernization of hydrological stations is in progress so the table will complement as new temperature sensors will be installed on the bathing rivers.

The measurements are carried out with temperature probes which continually measure temperature at a depth of 0.5 to 1 meter. That are the temperature sensors Pt100 (type RTD), OTT PLS pressure probes or OTT Ecolog 500/1000 measuring systems. Measurements are taken uninterruptedly with continuous data records, and hourly temperature values are published in near real time.

At some river gauges measurements are still taken manually. In those cases, a thermometer with lower measurement limits from 0°C to -5°C is used. The thermometer is integrated in the protective metal case which is perforated on the bottom side so that the water can circulate freely around the lower part of the thermometer. Measurement is taken in the middle of the river flow, and the thermometer is kept at the certain depth up to three to five minutes. Such measurements are taken once a day and are not shown in the table. Croatian Meteorological and Hydrological Service (DHMZ) has had data on river temperatures at some hydrological stations since 1948.