Exact areas set to be hit by 27C mini heatwave across UK - and the 11 that will miss it

Britain is set to enjoy a balmy 27C mini-heatwave - but a few unlucky areas will miss out.

over the next few days, forecasters say, with an area of high pressureafter a week of milder . Multiple areas will see conditions significantly hotter than the seasonal daytime average of 15C from today onwards, with the mercury expected to stay above 20C for the next seven days in some places. Things will be in the southeast and central areas, and will also be hot in the north, though areas to the west are expected to be much cooler.

Which areas will miss out on the mini-heatwave?

According to maps from WXCharts, the following regions will see temperatures in the mid-teens this weekend, rather than in the 20s:

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England

• Dorset
• Devon
• Cornwall
• Hampshire

Wales

• Dyfed

• Gwent

• West Glamorgan

• Mid Glamorgan

• South Glamorgan

• Gwent

• Powys

Thunderstorms also forecast for this weekend

Forecasters are also warning that some areas could see heavy downpours and "vigorous" thunderstorms tonight, particularly in the southwest.

These downpours will move into western areas throughout Sunday and into Monday.

Deputy Chief Meteorologist, Dan Harris, said: “From Saturday night, into Sunday morning, there is an increasing chance of rain, showers and isolated thunderstorms moving northwards across the southwest of the UK.

"As we continue through Sunday and into Monday, this will extend to other western parts of Great Britain and into Northern Ireland too.

"On Monday itself, we could see some particularly vigorous thunderstorms developing, most likely in Wales and parts of southern England, whilst elsewhere during this whole period, dry, fine, and increasingly warm conditions are expected.

“Should these thunderstorms develop, especially on Monday, there is potential for 25-35mm of rain to fall in an hour or so which may lead to some localised surface water flooding. Hail, lightning, and isolated strong wind gusts would be additional hazards."

'Medium' risk of summer drought declared

An unusually dry April and continued hot weather has caused some concern, particularly in the agricultural sector, where some farmers have reported issues with their crops.

England is currently experiencing its driest start to spring in 69 years - and this week the Environment Agency urged water companies to do more to safeguard water supplies, raising the risk of a drought this summer to 'medium'

It followed a National Drought Group meeting between the agency and the Met Office, representatives of the government, regulators, water companies, farmers and conservation experts.

In a statement, the Environment Agency (EA) said: "If the prolonged dry weather continues, water companies may need to implement their dry weather plans in the weeks and months ahead".

Bookies have already slashed odds on this May being the hottest on record, with Ladbrokes now putting it at 5/4 - down from 3/1 last week.