Ayr have called a 7.30am inspection on Wednesday ahead of Friday's meeting with officials doubtful that racing will go ahead.
The going is described as heavy, waterlogged in places and with further rain forecast prospects are poor.
"This rain is sitting on us at the moment but it is meant to clear away overnight," said clerk of the course Katherine Self.
"We've got a dry day forecast on Wednesday, but more rain is expected to move in on Thursday and Friday. It's not looking good."
All six races are due to be run on the straight course over five and six furlongs.

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