The good news is that the rain battering the coast is beginning to extend inland, to parts of the WA wheatbelt, especially in the Great Southern region.

Much of this wheatbelt country has been running well behind schedule in planting WA's huge winter grains crop, following an exceptionally dry autumn.

Until this week, it's had no seasonal break like the heavy Anzac weekend rains which kicked off the Victorian, southern NSW and SA winter grains season at the end of April.

The attached Bureau of Meteorology map shows the rainfall in the southwest of WA for the week ended 9am Friday - and that doesn't include rain from the second low now passing over the region.

In isolated areas, locally destructive gusts in excess of 125kmh might cause significant damage to property.

Isolated thunderstorms and small hail are also possible, the bureau says.

Rottnest Island, just to the west of Perth, yesterday recorded a wind gust of 115km/h.

Perth Airport saw gusts of 107km/h.

About 5,000 homes in Perth and the South-West are still without power after wild storms cut electricity from 62,000 houses yesterday.

Western Power spokeswoman Miriam Borthwick said: "We're expecting the South-West to take a hit as this new front crosses."

Yesterday, rail lines were brought to a standstill following the strong cold front that crossed the coast.

More rain and severe winds are likely to continue into the weekend in southern areas.