River water temperatures on   11 Jul 2024 / 12 Jul 2024


 River gauge  River 13 16 19 22 01 04 07 10
 Donji Miholjac  Drava 23.4 23.6 23.8 23.9 24.0 23.9 23.8 23.8
 Batina  Dunav 24.6 24.8 24.9 24.8 24.7 24.5 24.5 24.6
 Vukovar  Dunav 24.8 25.0 25.1 25.1 25.1 25.0 24.9 25.0
 Ilok most  Dunav 25.0 25.3 25.5 25.4 25.2 25.0 25.0 25.1
 Zagreb  Sava 14.1 14.2 14.2 14.2 14.2 14.2 14.2 14.2
 Bregana-remont  Bregana 16.9 17.5 17.9 17.8 17.6 17.2 17.0 16.9
 Samobor  Gradna 20.4 21.9 22.5 22.4 21.8 21.2 20.7 20.4
 Bračak  Krapina 21.7 21.6 21.7 21.8 22.0 22.1 22.1 22.1
 Luketići  Korana 23.4 24.2 24.6 24.4 24.0 23.7 23.4 23.3
 Jarče Polje  Donja Dobra 21.7 22.0 22.2 22.9 23.4 23.5 23.2 23.3
 Zamost 2  Čabranka 18.0 21.0 21.0 20.0 19.0 18.0 17.0 17.0
 Kozjak most  Kozjak jezero 23.7 23.9 24.0 24.2 24.4 24.3 24.1 24.1
 Portonski most  Mirna 19.4 19.4 19.4 19.4 19.4 19.4 19.5 19.6
 Izvor Rječine  Rječina 8.1 8.3 8.2 7.9 8.0 8.0 8.1 8.1
 Prevjes  Zrmanja 14.8 15.6 15.8 15.1 14.3 14.6 14.9 14.7
 Krupa  Krupa 14.3 14.2 13.9 14.9 14.9 14.9 14.4 14.2
 Roški slap  Krka 19.9 18.3 18.3 18.8 19.8 20.4 20.4 20.2
 Nacionalni park  Krka 25.0 25.4 25.6 25.7 25.7 25.4 25.3 25.3
 Dusina  Matica Vrgorska 16.2 17.1 17.5 17.6 17.3 16.7 16.1 15.8
 Metković  Neretva 22.1 21.8 20.7 20.5 20.6 21.7 21.4 21.4

River water temperatures on   11 Jul 2024 / 12 Jul 2024


 River gauge  River 22 01 04 07 10
 Donji Miholjac  Drava 23.9 24.0 23.9 23.8 23.8
 Batina  Dunav 24.8 24.7 24.5 24.5 24.6
 Vukovar  Dunav 25.1 25.1 25.0 24.9 25.0
 Ilok most  Dunav 25.4 25.2 25.0 25.0 25.1
 Zagreb  Sava 14.2 14.2 14.2 14.2 14.2
 Bregana-remont  Bregana 17.8 17.6 17.2 17.0 16.9
 Samobor  Gradna 22.4 21.8 21.2 20.7 20.4
 Bračak  Krapina 21.8 22.0 22.1 22.1 22.1
 Luketići  Korana 24.4 24.0 23.7 23.4 23.3
 Jarče Polje  Donja Dobra 22.9 23.4 23.5 23.2 23.3
 Zamost 2  Čabranka 20.0 19.0 18.0 17.0 17.0
 Kozjak most  Kozjak jezero 24.2 24.4 24.3 24.1 24.1
 Portonski most  Mirna 19.4 19.4 19.4 19.5 19.6
 Izvor Rječine  Rječina 7.9 8.0 8.0 8.1 8.1
 Prevjes  Zrmanja 15.1 14.3 14.6 14.9 14.7
 Krupa  Krupa 14.9 14.9 14.9 14.4 14.2
 Roški slap  Krka 18.8 19.8 20.4 20.4 20.2
 Nacionalni park  Krka 25.7 25.7 25.4 25.3 25.3
 Dusina  Matica Vrgorska 17.6 17.3 16.7 16.1 15.8
 Metković  Neretva 20.5 20.6 21.7 21.4 21.4
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.