Another summer heatwave is set to bring temperatures in excess of 30C to much of the south east of England from Wednesday this week, the Met Office has warned. READ MORE: Oxford attraction forced to close due to fire riskThe Met Office has now issued an amber weather warning for extreme heat across parts of England for Thursday, August 13, in place from 9am until 11.59pm. People have been warned about the extreme temperatures (Image: NQ)A spokesperson for the meteorological office said: "Following a warm night, a spell of very hot weather will affect England on Thursday. "The highest temperatures will be in parts of the east, southeast and the Midlands, where 37 or even 38 Celsius could be reached. Event cancellations for Wednesday and Thursday are already being announced in parts of Oxfordshire, and other impacts are expected on the day.