Britain is set to boil in yet another heatwave next week as the country's brief period of respite from searing heat could turn out to be short-lived.Temperatures dropped down closer to averages for this time of year from Wednesday, but they are expected to rise again from Saturday.A sixth heatwave of 2026 will arrive by next Tuesday, with large areas of central and southern England likely to see highs of 30C to 33C, Met Office forecasters said.Yellow heat health alerts have been issued for the East Midlands, West Midlands, South East, South West, East of England, Yorkshire and the Humber, and London.The warnings, issued by the UK Health Security Agency (UKHSA) will come into force at 9am on Saturday, August 8 and end at 9pm on Tuesday, August 11.Before then, thundery showers are set to batter the North and Scotland – but central and southern England are likely to miss out on most of the much-needed rain. Much of the country has already been left bone-dry after two record-breaking heatwaves in May and June, which led to more than 2,600 excess deaths.Two further heatwaves in July turned fields and parks brown from the lack of rain and led to a number of huge wildfires igniting in beauty spots. People walk across dry parched grass, turned yellow-brown due to a lack of rain, near Tower Bridge People look at the dry garden outside the Tower of London, turned yellow-brown due to a lack of rainThe yellow heat-health alerts warn high temperatures may have a significant impact across health and social care services in the affected areas, with a possible rise in deaths, particularly among those aged 65 and over or with health conditions. 'The warm weather is continuing once again,' said Honor Criswick, meteorologist at the Met Office, adding that Friday is set to be a 'nice, dry, settled day with quite a bit of warm sunshine around'.On Saturday, Northern Ireland and parts of Scotland can expect to see some cloud and outbreaks of rain, while it will be another dry day with plenty of sunshine elsewhere, with highs of about 29C (84F) across central and southern England and eastern areas of Wales, Ms Criswick said.'Where we see the sunshine, it's going to start to turn quite increasingly warm on Saturday,' she added.'Saturday night going into Sunday, that's a slightly warmer day, so temperatures are already going to be that bit higher starting off the day, which is why we'll see a bit of an increase once again on Sunday – probably reaching between 30C and 32C, and that'll be somewhere across south or south-east England.'Once again on Sunday we do just have some bits of showery rain sinking their way southeastwards, so a few more areas could catch a few showers.'But it's only just a few showers, and there's not much rain, really.'It's not going to be enough to make any real difference to the dry summer we've had.'A slight dip in temperatures is expected next Monday, reaching around 27C (81F) to 29C (84F) across southern England. A cyclist is surrounded by brown grass which has gone dry in the drought-like conditions in Richmond Park, London Aerial view of dry grass surrounding the King Power Polo pitch in Holyport, Berkshire A much-loved 300-year-old pond in Wiltshire has begun to dry up due to unprecedented temperatures Cyclists in bathed in the early morning sun as they ride through Richmond Park, London