The UK is on track to break its record for the hottest day of the year for two days running with temperatures forecast to soar up to 33C on Friday.
Hot and dry conditions are expected to continue with the weather on track to reach the low 30s in many areas, but it could surpass Thursday's record of 32.2C, the Met Office said.
Health alerts have already been issued across England by the UK Health Security Agency (UKHSA) and will remain in place until 09:00 on Monday as it warns of health risks to the wider population.
The heatwave could peak on Saturday at a possible high of 34C, with thundery showers forecast for North Wales and northwest England, and dry and hot conditions in the east.
According to the Met Office, by Friday afternoon many regions are also expected to pass the heatwave criteria - which means a temperature threshold is sustained for three consecutive days.
