Exact date 16-day UK heatwave could start in June with 20C weather set to last weeks Forecasters and meteorologists are predicting balmy temperatures of no less than 20C for 16 consecutive days next month 14:21, 20 MAY 2021 Updated The video will auto-play soon8Cancel Play now Subscribe When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice. Thank you for subscribingWe have more newslettersShow meSee ourprivacy notice The UK is poised to bid farewell to the dready and drab weather May has brought us with a 16 day heatwave in June.