Based on analysis of observational data we show that the impact of the North Atlantic Oscillation (NAO) and El Ni¿o--Southern Oscillation (ENSO) on the Danube river flow variability shows important decadal variations. A lag-correlation analysis reveals that winter SST from tropical Pacific and some regions from the North Atlantic are significantly correlated with the streamflow variations from spring and summer suggesting a possible predictive skill of the Danube river flow anomalies in these seasons using winter SST as a predictor.