Tourists to Uluru have been treated to the unusual sight of rain splashing down the side of the monolith.

Tour guide in Central Australia, Monica Foster, said she awoke to the sound of rain about 5:00am on Saturday, and it continued coming down during the day.

"It may happen a few times each year. The last time this happened was in January," she said.

Only about 1 per cent of tourists to Uluru witness any sort of rain on the rock, with steady rain like that which occurred on Saturday even more unusual, Ms Foster said.

"It [Uluru] was completely covered in cloud. Kata Tjuta was just poking out the top," she said.

Senior forecaster with the Bureau of Meteorology, Ashley Patterson, said about 10.2 millimetres of rain fell at Yulara between 6:00am and 7:00pm.

"They do get cloud bands coming through in this time of the year," he said.

He said the weather system that led to the rain was unrelated to events that saw Darwin also get unseasonal rain on Saturday.

The rain over Uluru had come from a cloud band that had been over Western Australia for about a week, he said.

Storm clouds hover over Uluru on May 31, 2015. ( Supplied: Graham and Jennie Jones )