Winter will well and truly hit Perth later today, with a rare storm system and cold front set to batter the west coast, bringing destructive winds, high tides and localised flooding ahead of a week of wet weather.

The cold front will be one of the worst to hit the state this year, according to the BOM.

"There is a risk of damaging winds of up to 100 kilometres per hour as the front moves through on Tuesday morning, with the slight risk that we could see destructive gusts of in excess of 125kph in Perth," he said.

The Gascoyne region is predicted to be hardest hit, with total rainfalls of up to 100mm forecast, which could result in localised flooding.

"The rainfall through the Gascoyne and the Pilbara for this event is unusual for this time for year for June it's quite rare that you get this type of rain,

Residents in the Pilbara, South West and Gascoyne regions are being warned to secure their properties, and tie down and pack away objects that might cause damage.

"As the front moves through the South West of the state, there is that chance we will see those damaging winds for coastal areas between Exmouth [and] Walpole, so pretty much the whole west coast,

K.J.