The FAO Food Price Index averaged nearly 162 points in October, up 3.9 percent from September, while still down 16 percent from a year earlier.

Its latest Cereal Supply and Demand Brief slightly trimmed its October 2015 forecast for global cereal production and now projects production at 2.53 billion tonnes, 1.1 percent below last year's record output.

Half of the forecast cut reflected dimmer expectations about maize crops in India and Ukraine, mostly due to adverse weather. Drought in Thailand prompted a reduction in the seasonal rice harvest projection.

At the same time, the forecast for global wheat production has been raised, largely reflecting a bigger harvest in the European Union than earlier anticipated.

World cereal stocks are expected to remain at a comfortable level, with global wheat inventories rising further, reaching their highest level in 15 years.

Drought and rain trigger a sugar high

FAO's Sugar Price Indexled the overall rise, surging 17.2 percent from September, amid fears that excessive rains in the main growing regions in Brazil would impact the sugarcane harvest and also reports of drought in India and Thailand. The sharp jump reversed the sub-index's decline since February.

Intensifying concerns that El Niño may hamper next year's palm oil supply in Indonesia, coupled with slow progress in soybean plantings in Brazil, due also to unfavourable weather, spurred a 6.2 increase in the FAO Vegetable Oil Price Index.

The Dairy Price Indexrose 9.4 percent from September on concerns that milk output in New Zealand would decline. The organisation’s Meat Price Indexwas stable.

The Cereal Price Indexalso rose, albeit by a modest 1.7 percent, pushed up in part by growing concerns over dry weather conditions affecting wheat crops in Ukraine and southern parts of the Russian Federation.

The FAO Food Price Index is a trade-weighted index that tracks prices on international markets of five major food commodity groups: cereals, meat, dairy products, vegetable oils and sugar.