Households are being urged to clear everyday items from their parked cars as temperatures are set to soar to 30C over the next few days. Vehicles left closed can heat up at an alarming rate, exposing anything left inside to potentially damaging conditions. According to the latest Met Office UK forecast, temperatures are expected to rise steadily, with parts of southern England approaching 30C by Friday, depending on cloud cover, and becoming widely warm throughout the weekend. Heatwave criteria