By Marcelo Teixeira

Brazil's commodities export hubs are strained with record volumes of soy, corn and sugar to be moved at a time of the year when rains start to increase in southern ports, according to traders, analysts and shipping data.

Exporters are reporting delays in coffee shipments due to a tight availability of trucks and containers, while loading waiting times for vessels have jumped, resulting in additional costs for traders and delays for the commodities to reach destinations.

Brazil ports have been dealing with high volumes this year, but rains in the south, the largest ever delivery of sugar on the expiration of the October contract in New York and the diversion of cargoes from northern ports to Santos port as a drought cut the Amazon River's water levels added pressure to the system.

"We are having trouble with container availability," said the chief trader of a large coffee exporter said on condition of anonymity, adding that the situation slowed exports in September.

He said the sugar industry is using a lot more containers, reducing availability.

Raw sugar is usually shipped in bulk, while refined sugar uses containers.

According to shipping data provider Datamar, container use for sugar exports jumped 86% in the year through August versus the previous year, while the number of containers used for coffee fell 5%.

For bulk carriers, the wait to load cargoes jumped.

Shipping agency Williams said the waiting time at CLI, a main sugar terminal in Santos, rose to 33 days on Wednesday from 17 days in September.

ING analysts said some sugar shipments scheduled to depart Brazil in October will likely be pushed to November.

A director at one of the largest sugar exporters in Brazil said, however, that buyers were already expecting the delays.

"But if it starts to rain much, it can get complicated," he added.

The forecast is for only light rains in the coming days at Santos, with heavier downpours expected from Oct. 28.

(Reporting by Marcelo Teixeira in New York; Editing by Jamie Freed)