The Bureau of Meteorology says there has been no rain for 55 days and there are no signs of any on the horizon.

The dry start to 2010 comes after a year when rainfall in Perth was well below the annual average.

It has prompted a warning by authorities for people to limit water usage ahead of this weekend's predicted hot weather.

The bureau's Stephen McInerney says temperatures have been above average for the start of this year and there is no sign of any rain for at least another week.

"Our longer term models haven't really shown up that much in the way of a rainfall signal so yeah looks like it's going to remain dry for the next week or so," he said.