Sun worshippers will finally be able to strip off their winter woollies and bask in some rays after weeks of grey skies and rain.
Summer will arrive in Britain and the country will bask in balmy temperatures as the mercury hits 25C, forecasters said.
Gareth Harvey, forecaster at MeteoGroup, the weather division of the Press Association, said: "It is looking good, summer is arriving.
"Tomorrow will peak at 20C towards the south east and temperatures elsewhere will hit the mid to high teens, even in Scotland and Northern Ireland."
Low cloud in the east on Tuesday morning will burn back to be replaced by sunshine, Mr Harvey said.
"Temperatures will go up to 23 or 24C in the south east and most of England and parts of Wales and Scotland will get in to the low 20s, with peaks in the London area."
By Wednesday temperatures will be even higher, peaking at 25C in London and the central south east."
Weather watchers should not pack away their umbrellas just yet though.
Mr Harvey said: "This week is going to look like summer but there are hints of change next week and the following week, with things becoming a bit more unsettled and bits of rain and showers.
"However, this is the best week on the horizon so far, with decent, summer-like weather."