Perth faces blistering 42C on Sunday SCORCHER: The beach could be the best way to keep cool for the next few days in Perth with 38c and 42C forecast. PERTH is bracing for a blistering three-day heatwave with the temperature tipped to peak at a searing 42C on Sunday. Sunday's uncomfortable 42C, with forecast cloudy weather, is a return to the extreme temperatures recorded in early January. Monday is also expected to reach 38C. Those looking for a cooler change will have to wait until Thursday next week, when the temperature is tipped to be just 28C and cloudy. The forecast for the weekend comes as extreme weather and fire conditions are tipped for much of the north and interior of WA today, including the Gascoyne and Central West and central and southern parts of the interior. The Week ahead - Perth Friday Max 35C Sunny. Sunny. Winds easterly 15 to 20 km/h tending southeast to southwesterly 20 to 30 km/h in the early afternoon then becoming southeasterly 15 to 20 km/h in the late evening. Saturday Min 20C Max 38C Sunny. Winds southeasterly 15 to 25 km/h turning easterly 20 to 30 km/h during the day. Sunday Min 24C Max 42C Partly cloudy. Partly cloudy. Winds easterly 25 to 40 km/h tending northeasterly during the morning then becoming light during the afternoon. Monday Min 25C Max 38C Chance of a storm developing. Isolated showers and thunderstorms from midday. Light winds becoming west to southwesterly 15 to 25 km/h during the day then turning southerly during the evening. Tuesday Min 24C Max 36C Chance of a storm. Isolated showers and thunderstorms. Light winds becoming southwesterly 15 to 20 km/h during the day. Wednesday Min 23C Max 34C Mostly sunny. Light winds becoming westerly 15 to 20 km/h during the day. Thursday Min 19C Max 28C Cloudy. Cloudy. Winds westerly 20 to 30 km/h turning southwesterly 15 to 25 km/h during the day.