Perth sits in southern or western Australia, where a Mediterranean-to-arid climate produces mild, wetter winters and long, dry summers, with the region’s biggest flood risk coming from occasional intense summer thunderstorms or ex-tropical cyclone remnants.
Western Australia’s capital sits on the Swan River, with a Mediterranean climate that concentrates most rainfall into the winter months. Because much of the region normally receives modest rainfall, a rare intense storm can overwhelm drainage systems built for a drier norm, and radar helps track these less-frequent but potentially serious events. Learn more: Flash Flood Warning Signs on Radar · Open the full Rain Map