The UK will be hotter than the Seychelles this Bank Holiday weekend with temperatures hitting 30C today before soaring to 33C on Monday. Britons have flooded parks, beaches and lidos on what has already been confirmed as the hottest day of the year so far.Temperatures in the village of Frittenden, in Kent, reached 30.3C this afternoon, the Met Office said - with the mercury still on the rise. Before now, Friday had seen the year's warmest temperatures when highs of 28.4C were measured in Heathrow, Cambridge and Cranwell in Lincolnshire.The UK is also forecast to see its hottest May day on record on Monday, with temperatures expected to reach 33C in southern England and the Midlands.The current May temperature record is 32.8C, recorded at Camden Square on May 22, 1922, and also on May 29, 1944 at Horsham, Tunbridge Wells and Regent's Park. Peaks of 31C are also expected on Sunday - with Marylebone Cricket Club saying it had dispensed with its strict dress code in the Lord's Pavilion due to the heatwave. The club said gentlemen would not need to wear jackets in the pavilion for a match between between Middlesex and Surrey tomorrow. Sunseekers cool off in the sea off Brighton, East Sussex, on Saturday A visitor uses a fan to cool down at the Queen's Joust medieval jousting competition during a heatwave at Leeds Castle near Maidstone, Kent People are pictured enjoying the sunshine at the Strand Lido in Gillingham today A visitor eats an ice-cream and holds an umbrella to shelter from the sun at the Queen's Joust medieval jousting competition in Kent Tourists out in the hot weather at Buckingham Palace in London on Saturday People enjoy the hot weather in St James's Park in London on Saturday An amber heat health alert for the 'exceptional spell' of 'notable weather' for May has been issued by the UK Health Security Agency (UKHSA). It covers the East Midlands, West Midlands, the east of England, London and the South East and will remain in place until 5pm on Wednesday. The alerts mean there is likely to be 'a rise in deaths, particularly among those aged 65 and over or with health conditions' and increased demand on all health and social care services, according to the UKHSA website.It is the earliest ever health warning to be issued for the country, as the health security agency alerts are normally only reserved for summer months. Yellow alerts have been issued for the north-east and north-west of England, Yorkshire and Humber, and the South West.The less severe alert means significant impacts on health and social care services are possible. Speaking in St James's Park in London, Jo Stockley, who was enjoying the heat with her husband Robin, said the weather was 'amazing', adding: 'I'm quite enjoying it at the moment.'She said: 'It just started, right? Ask me the same question in a couple of weeks and you might get a different answer, but at the moment, brilliant.'Alexi Antonino, who is on visiting London from Detroit, Michigan, with her son TJ said the heat feels 'normal' for them, but also that the UK does not have the same air conditioning as in the US.She said: 'It's very hot or very cold where we live, so this is kind of normal.'In the States, we have air conditioning blasting, so we're coming off of a very cold winter, so it's a little bit nice right now.'She then told reporters: 'I hope you get some relief soon with the weather!' A couple walk to the backdrop of the lighthouse at Portland Bill amid high temperatures Tourists take a selfie in the sunshine in front of the Queen Victoria Memorial at Buckingham Palace People enjoying the warm weather on Sunny Sands beach in Folkestone, Kent Traffic queuing for the Euro Tunnel site along the M20 motorway in Folkestone, Kent A UK heatwave is official when a location records at least three consecutive days of daily maximum temperatures which meet or exceed a specified threshold - which varies by region Children play at the Olympic Park Splash Fountain at Queen Elizabeth Olympic Park in Stratford, London An amber heat health alert for the 'exceptional spell' of 'notable weather' for May has been issued by the UK Health Security Agency (UKHSA)Despite the predicted hot weather, some areas of the UK may experience cloudier conditions today. This is due to a cold front that could bring some patchy drizzle to north-west Scotland, Northern Ireland and some western coastal regions. It comes after temperatures hit 28.4C in Heathrow, Cambridge and Cranwell in Lincolnshire on Friday afternoon, marking the hottest day of the year so far.The heatwave is expected to continue over the weekend, with 31C expected to be logged on Sunday, the Met Office said.UV levels will also be high across much of the UK over the bank holiday weekend, with a UV index of seven expected in Cardiff and London on Saturday. Greg Dewhurst, media adviser and senior operational meteorologist at the Met Office, said: 'High pressure will dominate through the whole of the Bank Holiday weekend.'Plenty of very warm sunshine across England and Wales each day.'Scotland and Northern Ireland will see more cloud at times, with a few showers across north-west Scotland.'During the heatwave, people have been advised to keep their homes cool by closing windows and curtains in rooms that face the sun. They should also seek shade and apply sunscreen regularly, and are advised to keep out of the sun between 11am and 3pm.Physical activity such as exercising or walking a dog should take place in the morning or evening when temperatures are cooler. A man pulls a crab or lobster pot out of the sea at Portland Bill today People ride on swan paddle boats on a canal at Queen Elizabeth Olympic Park in Stratford in LondonThe UK Health Security Agency has activated a heat health alert until next Wednesday A woman in costume uses a handheld fan during hot weather at Comic Con at ExCeL in Royal Docks, London A woman with ice creams in the hot weather in St James's Park in London People walk to the backdrop of the lighthouse at Portland Bill on Saturday People have also been advised to look out for signs of heat exhaustion and heatstroke.Heat exhaustion symptoms include tiredness, feeling faint, intense thirst, heavy sweating, and feeling or being sick.Signs of heatstroke include confusion, lack of co-ordination, a fast heartbeat, hot skin that is not sweating, and seizures.A heatstroke is a medical emergency and people are advised to call 999 if they believe someone is experiencing one, according to UKHSA.Dr Anya Gopfert, consultant in health protection at UKHSA, said: 'We know that even moderate heat can lead to serious health problems, especially for older people and those with certain health conditions, so it's important that everyone takes simple precautions while enjoying the warm weather over the coming days.'If you have friends, family or neighbours who are more vulnerable, it is important to check in on them and ensure they are aware of the forecasts and are following the necessary advice.'