May is set to come to a soggy end across Britain – with further spells of thunderstorms and showers – before temperatures soar to 27C this weekend.
June will get off to a scorching start with the welcome return of hot and humid weather after days of rain, cloud cover and cooler temperatures.
The Met Office said the post-Bank Holiday conditions will be rather cool and showery for a few days before it becomes increasingly warm and humid after Friday.
Most of the country will enjoy balmy weather over the weekend and Britain could see its hottest temperatures of the year with forecasters predicting highs of 27C just a few weeks before summer officially arrives.
Until then, Tuesday will bring a mix of sunshine and showers, with the heaviest and most frequent rainfall over eastern and central parts of the UK.
Thunderstorms are possible in those areas.
It will be largely dry and sunny with just the odd shower elsewhere as highs range between 12C in the north and 20C in the south, the Met Office said.
In the evening, showers will gradually fade and make way for a dry and chilly night.
Rain will move into Northern Ireland, Wales and southwest England overnight.
Heavy bursts of rain will hit on Wednesday as showers spread east and much of the country remains under grey skies.
It will be a touch cooler with highs of 13C in the south and 16C in the north.
Thursday and Friday will be largely cloudy with outbreaks of rain mainly in the north and west, the Met Office said.
But temperatures will start to climb in the south – hitting 22C – and gradually in the north to 16C.
Forecasters are predicting long sunny spells in many sheltered central and southern areas as it becomes increasingly warm and humid on Saturday.
The Met Office said temperatures could hit 27C in those areas on Saturday, and the humid conditions could spawn thunderstorms over the weekend.
Highs of 27C would make the UK hotter than traditional sun destinations in Spain, including the party island of Ibiza and Barcelona, where highs of 23-24C are expected over the weekend.
The Met Office said: "The weekend will be much warmer than recently and locally very warm in the south and east where brightest conditions are likely.
"It could also be quite humid.
"Scattered thundery showers may break out, with cooler conditions spreading southeast to most parts by Monday."
Met Office meteorologist Aidan McGivern added: “Further south, [there will be] sunny skies through Saturday and Sunday and temperatures climbing into the mid or even high 20s.
"A very warm weekend to come in the south [with] hot sunshine developing in the far southeast."
Met Office five-day weather forecast
Sunshine and showers today, these most frequent and heavy across eastern and central parts, where a rumble of thunder is possible.
Elsewhere it will be largely dry and sunny with just the odd shower.
Showers gradually fading through the evening to leave a dry night for many and turning chilly.
However, more persistent rain will gradually spread into Northern Ireland, Wales and southwest England.
Cloud and rain will slowly spread east with some heavy bursts possible.
Grey skies for many in the afternoon with drizzle.
However, sunshine and showers are likely in northern Scotland.
Thursday to Saturday
Largely cloudy on Thursday and Friday with outbreaks of rain, mainly in the north and west.
Long sunny spells in many sheltered central and southern areas.
Increasingly warm and humid.
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