Perth weather: 32C heat before showers, possible thunderstorm roll in

Perth is set for a burst of hot weather before showers and a possible thunderstorm roll in, with temperatures tipped to plunge.

The Bureau of Meteorology is forecasting a hot, mostly sunny 32C day on Wednesday, with the chance of showers increasing late in the afternoon and evening.

With the UV index reaching 9 — classified as very high — sun protection is recommended up to about 4pm.

The heat will give way to a wet and cooler Thursday, with a very high chance of showers and the possibility of an early morning thunderstorm.

The temperature is forecast to reach just 22C after a minimum of 15C, with a 75 per cent chance of at least 2mm of rain.

The cooler conditions will stick around, with a maximum of 23C on Friday after an overnight low of 11C, although the chance of rain will ease.