Met Office spokesman Dan Williams told Aol Travel: "It could be the hottest day of the year today, with a chance we could get close to or beat the 23.8C set at Drumburgh, Cumbria on 7 May. Hottest places are likely to be in the South East area.
"After today, temperatures remain on the warm side, with 22C likely on Wednesday and Thursday, and perhaps 24C or 25C possible on Friday.
"The weekend stays in the low 20s, with 23C likely on Saturday and 22C on Sunday. Again, warmest temperatures are likely to be in the south east of the country, but most places will not be too far behind.
"Most places will see fine and settled weather, with a good deal of sunshine at times and generally light winds.
"The warm spell looks set to last through the weekend and perhaps into the start of next week, but there are some early signs that we might see some more unsettled conditions moving in during next week."
Leon Brown, meteorologist at The Weather Channel, agreed, telling Aol Travel: "High pressure will dominate our weather for at least the next week. This means settled and dry weather for much of the UK. However, with the North Sea still several degrees below normal after the cold spring, and winds often from the east, temperatures will be tempered somewhat. There will also be the risk of low cloud and mist at times in the east.
"On Wednesday, the best of the sunshine will be along the south coast, south west England, west Wales and also western Scotland. with temperatures reaching 19C to 20C. Only 12C to 14C where it stays cloudy in the east.
"Similar on Thursday with plenty of sunshine in the west but more cloudy at first in the east, becoming mostly sunny later. Warmest areas in the south and south west reaching 22C.
"Friday could be the warmest day in the south with sunny skies for much of the UK, but still the risk of low cloud over East Anglia. A fresh easterly breeze along the Channel and near eastern coasts, but inland from West Sussex to Devon and Cornwall temperatures will reach 22 to 23C, and locally 24C in Dorset/Hampshire. A 30% chance of 25C.
"This would be the warmest day of the year so far. West Wales, north west England and western Scotland also warm reaching 20C to 23C.
"The weekend also looks fine, dry and mostly sunny for central and western Britain with temperatures reaching 21C to 23C, but cooler in the east and the risk of low cloud and mist near eastern coasts moving in off the North Sea."
But, sadly, the hot temperatures may only be short-lived. Leon added: "We expect the settled weather to last until early next week then a change developing from the west. The middle of June is likely to become more unsettled again, especially in the north and west, with showers and cooler temperatures."
Make the most of the balmy weather at Britain's most beautiful beaches:
The UK's ten best beaches (according to Tripadvisor)
UK to see hottest day of the year this week
The good: "Great beach with sand dunes for shelter from the wind and a lovely gentle slope into the water. Nice clean beach."
The bad: "Not really a beach for sunbathing or swimming, but a beautiful place for a walk. Well worth a visit."
Did you know? Oscar-winning actress Tilda Swinton lives in Nairn.
The good: "One of the 10,0000 wonders of the world" raves one Tripadvisor reviewer, while another calls it a "sandcastle makers heaven!" The bad: "What's all the fuss about? 60's apartments and tacky seaside galore." Did you know? Property here is notoriously pricey. In 2009 a 1,393-square-metre plot was reported to have been put up for sale for £13.5 million. Some houses going for a steal at £7,750,000!
The good: "Just watch the waves all day. Sunny but very windy day which is the best way to see Fistral Beach. Can spend hours walking around the headland then sit and have a drink whilst watching the surfers." The bad: "Parking restrictions a nightmare." Did you know? The British Surfing Association, Newquay Surf Life Saving Club and the Newquay Boardriders Club are all based at Fistral Beach and the Boardmasters Festival is also held there.
The good: "It's got sand, and clean sea. Enough said really." The bad: "All the above reviews are fine - that is if you can find somewhere to sit squashed in among the hoardes." Did you know? Weymouth was given a Royal seal of approval by King George III. He used to visit during times of illness for a restorative paddle.
The good: "My 'Safe Place'. I must have walked this beach over a hundred times in all weathers and it never fails to amaze me." The bad: "Why does everywhere you go for a pleasant walk have to be infested with dogs and their stupid owners?" Did you know: Longsands has its own webcam, so you can check out the weather before you head for the beach, see it here.
The good: "Beautiful beach surrounded by cliffs, large enough to never feel crowded even in peak season. A lovely beach bar on the beach which serves food all day and dog and child friendly."
The bad: "Perranporth Beach is lovely, what a pity about some dog owners who seem to think it is alright to allow their dogs to mess on the beach and then just walk away leaving it where young children are playing."
Did you know? The Perranporth Surf Life Saving Club is one of the oldest in the country and hosts an extreme triathlon event every autumn.
The good: "Hengistbury Head is one of my favourite places in the world. It's one of those spots that restores peace to your mind." The bad: "A bit bleak and windy, not much to do except pitch and putt." Did you know? People have been settling at Hegistbury Head since the Stone Age and it has over a million visitors per year.
The good: "Sun, Sea and a secret seal that visits the shore here most days. Family-friendly with lots locally to see and do - like dipping your toes back into 1960's seaside family holidays for the day." The bad: "Great beach but there are so many more spectacular and less populated beaches in the St Ives area." Did you know? It's home to the Porthminter Cafe, a multi-award winning seafood restaurant smack bang on the shoreline.
The good: "Heaven. The nicest beach I've seen in the UK." The bad: "Get your binoculars out...the sea is over there. The tide was out but there was a disproportionate amount of dry/wet sand (as in miles of wet and a small patch of dry) considering how far out the sea was." Woolacombe trivia: During the Second World War, the U.S. Army based their Assault Training Centre here. Thousands of small boat crews and infantry practised amphibious landing assaults on the beach because its long flat shape was considered to be like the Omaha Beach landing area.
The good: A "gem in the crown of Gower" has "unbelievable views"; it's "clean and peaceful... "The BEST in the West."... "The most amazing sight on the lovely Gower Coast."
The bad: "It is a lovely beach, but it is more of an adult orientated one, you park your car up the top of the hill and start walking, either down to the beach, or over the cliffs, which if you have children, I would not recommend."
Did you know? Rhossili Bay is located in an area designated as the first Area of Outstanding Beauty in the UK.