Estuarine processes are being transformed by climate change and anthropogenic impact. The goal of this study is to assess changes in abiotic factors at the river border of the Ob-Taz estuary (Ob - Salekhard), including water and thermal discharge on a seasonal and multi-year scale, and fluctuations in water level. There are significant trends towards an increase in average annual runoff in the current climatic period (1981-2010) and in winter runoff in the entire observation period. The annual variation of the temperature regime is synchronous with fluctuations in the water discharge. No significant trends were found in the seasonal and annual averages. The study findings will be used in the modeling of seasonal hydrological processes in the Ob-Taz Gulf.