Rain in the harvest season in Brazil, the biggest coffee producer in the world, boosted prices on July 3 to the biggest level since May 18, to $1.8045 a pound for the September contract, according to the National Coffee Council, a producing association.

Concerns over the sustainability of world coffee consumption may reduce strength of the price rally, said the association, known as CNC. in a weekly report sent by e-mail today.

Rain in the producing areas also affected the quality of coffee beans and have delayed harvesting, CNC said.

To contact the reporter on this story: Mario Sergio Lima in Brasilia Newsroom at mlima11@bloomberg.net

To contact the editor responsible for this story: James Attwood at jattwood3@bloomberg.net