A SUNNY Sunday will mark the end of May's mini heatwave – before rainfall and thunderstorms are set to dampen the UK next week.

Spells of warm weather on the weekend will be a slight relief from the wind and rain that's already unsettling the forecast.

Brits across the country will have to face showers as the UK is set to be "cooler than it has been", according to the Met Office.

Although London could reach 24C on Sunday, this will be the last day of sunshine for some time.

Another weather front on Sunday will bring rainfall from the West and cooler temperatures.

Richard Miles, of the Met Office, explained how a high pressure system from the continent is responsible for the heat and dramatic thunderstorms seen in some areas this week.

He said there is a chance that this high pressure system will "encroach into the very far corner of the South East early next week and bring yet more thunderstorms to the region".

However, forecasters now consider the possibility of blood rain unlikely, as the continental weather system loses its grip on the UK.

Blood rain occurs when relatively high concentrations of red dust or particles get mixed into rain and make it look red-hued as it falls.

When this red rain falls in the UK, it often leaves desert sand residue on cars and other surfaces.

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Richard said that the recent good weather "is going to fall off Monday, Tuesday.

"Most places early next week will be feeling cooler than they have been this week."

Elsewhere in the country will see "temperatures generally trending down to closer to average", Mr Miles said, "with showers coming from the West", with temperatures of 16C in the South West and 14C in parts of the North East.

The average temperature for the month of May in England is 16C, but temperatures soared to 27.5C on Tuesday in south-eastern areas, the hottest day of the year so far.

It meant the weather was better here than in holiday hotspot Santorini, where it reached only 26C.

But the heat was followed by grey skies and overnight downpours for many.

Met Office deputy chief meteorologist Dan Rudman said: "The strengthening of the jet stream increases the chances of low-pressure systems developing over the Atlantic being pushed towards the UK.

"Although there are still some details to be determined on the depth and timings of these lows, what we do know is that there's some unsettled weather on the way next week, with some strong winds likely from the middle of the week, especially in the north.

"Weather of this nature isn't unusual in a UK spring, with changes in the jet stream frequently bringing interludes of unsettled weather."

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