The Agriculture Department estimates WA will deliver 10mt-12mt of grain for this harvest while CBH fears the figure could be less unless some reasonable rainfall is received.

The department says despite WA growers putting in more crops this year to capitalise on high grain prices, a dry May meant it was unlikely this year's crop would beat the record of 14.5mt set in 2004.

CBH logistics executive manager, Tim Collins, said the situation was looking bleaker by the day and initial hopes of a record crop had evaporated.

"The way things were at early seeding it would have been reasonable to plan for a 10mt-15mt crop," Mr Collins said.

"We have definitely dropped that and are working at an 8mt-12mt range."

Mr Collins said there was still some time for reasonable rainfall to provide growers the descent break they deserved and push up the estimate.

"We are hoping it does not go any lower than 8mt," he said.

"It is very disappointing and I think the impression we get is that it is looking similar to last year in some respects."

Mr Collins said the northern agricultural region was dry, but better than last year, while Esperance was reasonable but not as good as last year.

"East of Esperance is looking drier than last year," he said.

Mr Collins said growers in the Geraldton zone were still hopeful as some good rain could still turn the situation around.

"The fact is we still don't see any reasonable rain on the radar.

"We are worried about growers up there if the situation gets bad."

Mr Collins said the western area of the Kwinana Zone was looking "okay" but Merredin was still dry.

He said Albany was looking good.