The population of 25 million is already stressed and vulnerable with malnutrition among children that could worsen, stunting their growth, it said.
"This is not yet classified as a drought, but rice, maize and other crops are already withering in the fields, with potentially catastrophic effects for the people of DPRK," said Joseph Muyamboit, the IFRC's program manager in Pyongyang. "We cannot and must not let this situation become a full-blown food security crisis. We know that previous serious dry spells have disrupted the food supply to a point where it has caused serious health problems and malnutrition across the country."
Drought and floods have long been a seasonal threat in North Korea, which lacks irrigation systems and other infrastructure to ward off natural disasters.
The IFRC was helping the national Red Cross to support 13,700 of the most vulnerable people at risk, in South Hamgyong and South Pyongan provinces.
It had deployed emergency response teams and 20 water pumps to irrigate fields in the hardest-hit areas, it said.