"We are in the midst of a humanitarian crisis ... We need international support to get through this crisis," Moise said in an interview with news agency Reuters.
His call for help comes two months into anti-government demonstrations that he has attributed to the exacerbated food insecurity in the country.
While protest turnout in what has become the country's longest wave of demonstrations for years has weakened over the last two weeks, opposition parties and organizations have scheduled a nationwide protest on Monday to demand Moise to step down.
Monday is a national holiday in Haiti which commemorates the victory over the French in a major battle of the country's independence war.