The paper discusses the impact such a climate change may have on water resources on the River Nile, in particular in the basin of Lake Victoria, and of a hydrological forecasting system on the River Niger. It further outlines the ways of exploring the consequences of such development by using hydrological and water management models. Author proposes that real-time hydrological forecasting systems, able to produce forecasts with long, medium and short lead times, are one of the most effective measures to offset possible negative effects of the climate change, by increasing the effectiveness of storage management.