The World Meteorological Organisation and International Centre for Integrated Mountain Development have initiated a pilot project under which hydrological and meteorological data are collected and posted on a web site.
Most governments believe it will give them real-time data on rainfall and water level rises.
Low-lying Bangladesh in particular is keen to get data from upstream countries.
Last year, more than 600 people died because of floods there.
Bangladesh, and Nepal, would both like access to India's regional satellite data.
"India has assured us that it would pass on to us such data which it receives through its satellite," says Keshab Prasad Sharma, senior hydrologist at Nepal's department of hydrology and meteorology.
"We need to rely on India because we do not have the required technology."