UNITED NATIONS  Global food prices are moving ever higher, hitting record levels last month as a jittery market reacted to unpredictable weather and tight supplies, according to a United Nations report released Thursday.

It was the seventh month in a row of food price increases, according to the United Nations Food and Agriculture Organization, which put out the report. And with some basic food stocks low, prices will probably continue reaching new heights, at least until the results of the harvest next summer are known, analysts said.

“Uncertainty itself is a new factor in the market that pushes up prices and will not push them down,” said Abdolreza Abbassian, an economist and the grain expert at F.A.O. “People don’t trust anyone to tell them about the harvest and the weather, so it has to await harvest time.”

Scattered bright spots in the report led experts to suggest that a repeat of the 2008 food riots stemming from similar sharp price increases might not be imminent. Rice was slightly cheaper and meat prices stable, they noted. But the overall uncertainty and inflation could eventually make the situation worse than three years ago, they said.