Thursday will be the hottest day of the week with temperatures reaching 18C to 20C in southern England and 21C in London, forecasters have said.
The rest of the UK is expected to be a lot cooler in Thursday as a weakening cold front moves southwards with a lot of cloud.
Chief forecaster Leon Brown at The Weather Channel told AOL Travel: "It will feel a lot cooler on Good Friday in the south, but sunny over the north and west after a touch of ground frost early on.
"The South East will be cloudier and temperatures are expected to be 9C to 11C around eastern coasts in a chilly northeastern breeze. The North and West will be 13 to 14C."
Leon adds that there will be "little change for Saturday with sunny weather for the North and West, but a chilly start and ground frosts. It will be cool and partly to mostly cloudy over the South and South East, with a chilly northeastern breeze."
A few showers are likely over the South East in the morning and the best temperatures will be in Scotland, reaching 16C, but more like 12C to 14C in the south and 10C near eastern coasts.
The wet weather returns on Sunday for the South. Leon says: "In fact we could see 20 to 25mm of rainfall across southern Britain during the day. Rather cool too with temperatures only 8C to 10C in the South West and South Wales in the afternoon rain. The best weather again over the North with sunshine and light winds for much of Scotland. Temperatures reaching 17C in the Inverness area."
Easter Monday will see a mixture of sunshine and showers for most areas - some heavy over central Britain. The best chance of staying dry will be western Scotland and in the far South East of England. "Temperatures will be typically 12C to 13C, possibly 15C in the South East," says Mr Brown.
Meanwhile, the Met Office has warned Britons about the importance of using sun cream due to strong UV rays.
The Met Office said: "This is due to an ozone anomaly affecting the UK at the moment where levels are noticeably lower than normal. This is quite normal and similar events have occurred previously around this time of the year. We are confident that the levels should be no higher than those of a sunny day in June.
"It is important that, if you are in an area that is particularly sunny over the next few days, you take steps to ensure that you and your family are protected from these increased UV levels."