A third heatwave has already begun in one UK area12:26, 07 Jul 2026Temperatures could reach as high as 35C this week as widespread heat takes over the UK again.‌It comes after temperature records were broken three days consecutively in a heatwave last month, with a new June high of 37.7C recorded. And although temperatures temporarily cooled down, another heatwave is set to hit the UK this week.‌One area in the UK has already hit its heatwave threshold. Southeast England is now officially in a heatwave after 3 days of temperatures above 28C, the Met Office confirmed on Monday (July 6).‌Click here to get the biggest stories straight to your inbox in our Daily NewsletterThe hottest weather of the week is expected on Thursday and Friday, the Met Office says, as high pressure remains dominant.