A man has died in a single vehicle rollover that left his car completely burnt out in Western Australia's Wheatbelt region.

The man was about 5km from the Williams township when his car rolled just after midnight (WST) on Sunday.

Police have yet to identify the man.

It follows a crash in Toodyay, 85km northeast of Perth, on Saturday in which a man died and a woman was seriously injured.

The state's road toll for the year is now 29.