The Bureau of Meteorology is warning this week's warm weather is just the start of what will be a long and hot build-up to the wet season.
The bureau's three-month forecast predicts higher-than-usual daytime temperatures for most of the Kimberley.
In the Pilbara, daytime temperatures should stay close to average but there is a 70 per cent chance of above-average maximums at night.
Forecaster Patrick Ward says this week will kickstart the heatwave and could put the month of August in the record books.
"Over the next few days we're looking at temperatures in the high 30s and that's close to records at most sites for August and during the winter," he said.
"So yes, a particularly warm few days ahead and possible a few sites could break a record."
© ABC 2012
17:01 EST Sydney's offshore Sea Surface Temperatures (SST's) have remained above 21 degrees for the last four days.