Despite that warning however, the UN Food and Agricultural Organization expects rice output to slightly surpass "excellent results" recorded last year, though the FAO cut its global forecast for production of unmilled rice to about 725 million tons from its previous figure of 732 million.
The world is feeling the onset of the El Nino weather phenomenon, which has a natural warming effect, is active in the western Pacific and expected to last until winter in the northern hemisphere, according to Japanese meteorologists.
The US farm belt has been ravaged by the most stifling drought since the 1950s, and the country's contiguous 48 states have just sweltered through the hottest July on record.
Corn production is probably at the lowest level in six years, the US Department of Agriculture said, and curtailed production will likely send corn and soybean prices to record highs, it added.
"Cereal prices have shot up, with an increase in (corn) prices of almost 40 percent since June 1," strategists at the CM-CIC brokerage noted.