More than 600,000 people in Burma need food assistance due to natural disasters, violence and conflict, the UN World Food Programme (WFP) said on Wednesday.
Bangladesh is lashed by typhoons, and the Rohingya camps are clustered in a part of the country that records the highest rainfall.
Over 100,000 Rohingya refugees huddled in squalid, muddy camps in Bangladesh will be in grave danger from landslides when the mid-year monsoon season begins, a UN humanitarian report says.
The continuing hostilities, which began on 19 January in Sumprabum township, Putao District, in northernmost Kachin State, have included numerous rounds of mortar fire and artillery.
Tensions mount at refugee camps in Bangladesh holding hundreds of thousands of Rohingya Muslims over an operation to send them back to Burma, from where they have fled following a military crackdown.