The UK is bracing for a 33C heat surge as 25 areas are forecast to see the hottest conditions. Met Office deputy chief forecaster, Steve Kocher, said: “Temperatures will climb through the weekend, especially in the south, where 30°C is likely to be recorded on Saturday and 32°C on Sunday. Temperatures are forecast to peak on Monday when we could see 33°C recorded in southern England and the Midlands." The areas covered here are: Staffordshire, Leicestershire, Warwickshire, Worcestershire, Northamptonshire, Cambridgeshire, Suffolk, Norfolk, Essex, Hertfordshire, Bedfordshire, Buckinghamshire, Gloucestershire, Wiltshire, Herefordshire, Hampshire, Surrey, Kent, Greater London, East Sussex, West Sussex, Dorset. The Met Office has also warned people heading to the coast that they should "be mindful that sea surface temperatures are not as high as they would be in mid-summer." This means swimming still carries risks as water could still be dangerously cold. FOLLOW OUR BLOG BELOW FOR UPDATES... Temperatures on Monday Weather maps for Monday show London will see the hottest temperatures, with highs of 30C forecast. Surrey and Hertfordshire will also see the mercury climb to 30C. South Yorkshire will also bask in the boiling 30C heat alongside parts of north east Wales. Leicestershire, Derbyshire, Staffordshire, Warwickshire will all be just a degree cooler at 29C. East Wales will bask in highs of 28C, whilst the capital Cardiff will enjoy temperatures of around 27C as will Somerset. Crowds gather on beaches during heatwave Here is a photo taken earlier today in Falmouth, Cornwall. Very warm period until next week, forecaster said Met Office deputy chief forecaster Greg Wolverson, said: "A very warm period of weather will develop through the weekend and into next week for much of the UK." Heat health alerts The UK Health Security Agency (UKHSA) issued amber heat health alerts on Friday morning for the East Midlands, West Midlands, the East of England, London and the South East. The alerts will remain in place until 5pm on Wednesday and replace less severe yellow alerts, which were previously issued. UK has seen hottest day of the year The Met Office has also said the UK has seen the hottest day of the year so far, the Met Office confirmed. The village of Frittenden, in Kent, hit 30.3C on Saturday and the forecasting body said temperatures are still rising. Before now, Friday had seen the year’s warmest temperatures when highs of 28.4C were measured in Heathrow, Cambridge and Cranwell in Lincolnshire. List of warmest counties Staffordshire Leicestershire Warwickshire Worcestershire Northamptonshire Cambridgeshire Suffolk Norfolk Essex Hertfordshire Bedfordshire Buckinghamshire Gloucestershire Wiltshire Hampshire Surrey Kent Greater London East Sussex West Sussex Dorset Devon Cornwall Be 'weather ready' The Met Office is encouraging the public to be “weather ready” by making informed choices on swimming and locations as they head outdoors or to the coast to enjoy the sunshine. Temperatures expected to reach 32C Temperatures will climb through the weekend, especially in the south, where 30°C was recorded on Saturday. Temperatures could reach 32°C on Sunday, the latest forecast also said.