UPDATE: A lightning strike is believed to be responsible for a fire at an elderly couple's house this morning, firefighters say.
The power and phone lines of the High Wycombe house were fried, a Department of Fire and Emergency Services spokesperson said.
The fire at the Marshall Road residence caused damage estimated at $2000.
Perth will experience some dramatic weather conditions during today's Federal election.
The metropolitan area had isolated rain and thunderstorms this morning that may continue throughout the day.
A maximum temperature of 21C is expected, however the sky is unlikely to clear up until the afternoon when the thunderstorms contract to the hills.
Winds also are expected to pick up around noon, becoming southwesterly at speeds of 20-30km/h, with rainfall of between 1mm and 6mm.
Regionally, south to south-east of Perth can expect a shower or two throughout the day with areas including Narrogin, Albany and Esperance at risk of a storm.
The State's north is expected to be clear, with Broome predicted to reach a high of 29C, while Halls Creek and Kalumburu are expected to reach temperatures of more than 30C.
Towns including Meekathara, Geraldton and Laverton also could experience some rain.
The weekly forecast is for sunshine in Perth from tomorrow until Wednesday, when showers are likely to hit.