It follows forecasts for temperatures in the mid-30s later this week. The notice will be in place from midday on Tuesday until 6pm on Saturday 13 August for all areas of England. The warning system was only created this year after the HSA was established in 2021. Last month, it issued a level 4 warning when temperatures reached 40C in parts of southern England. Dr Agostinho Sousa, head of extreme events and health protection at HSA, said: “We want everyone to enjoy the warm weather safely when it arrives, but remember that heat can have a rapid impact on health. “It is important to ensure that people who are most vulnerable – older people living alone and people with underlying conditions – are prepared to deal with the heat. “The most important advice is to make sure they stay hydrated, keep cool and take steps to prevent their homes from overheating.” With the latest heatwave coming after months of low rainfall, which has left the countryside and urban parks and gardens dry, households in some areas are being told not to light fires or barbecue. Two water companies have already announced tire bans and others have warned they may have to follow suit, following the driest eight months from November to June since 1976 and the driest July on record for parts of the south and east England.