Thermometers will top the mid-20C in southern and eastern England on Monday as the post-tropical storm skims the country.
Where the sun breaks through, ground temperatures can reach 30°C, well above average for the time of year.
Scotland and northern England will avoid the choking plume and by Tuesday thermometers will plunge across the country.
The remnants of a second ex-Hurricane, Earl, will head into the UK after Danielle, but rather than triggering another downpour it will help create high settling pressure.
Met Office meteorologist Aidan McGivern said: ‘It will be a blustery start to the week but this breeze, because it comes around former Hurricane Danielle, is bringing tropical heat.
“So for the start of next week it looks quite warm, especially in the east if we have sunny spells.”
“If we get some sun in the south and temperatures in the southeast will hit the low to mid 20s.”
Computer models, thrown into confusion by the arrival of two former hurricanes, suggest that high pressure will develop after the middle of the week.
Some forecasters originally predicted that the low pressure would continue to cause unstable conditions through next weekend.
Now they prefer the UK weather to settle in after Wednesday, with the prospect of even higher temperatures during the day before cool nights.
Netweather forecaster Ian Simpson said: “Current model outputs suggest a strong signal of a return of high pressures, bringing mostly dry sunny weather to most of the country, with warm days and cool nights. “
“This dry weather may continue for some time, creating further drought issues, although for many parts of the country the drought will have been eased by rains and thunderstorms over the past week.”
Warm weather starting Monday will be a combination of tropical winds surrounding the ex-Danielle and warm air blowing in from the mainland.
However, this will stagnate in the south of England, with Scotland and the north only reaching the mid-teens.
After driving a choppy start to the week, both hurricanes will crash over the Atlantic.
Remnants of Hurricane Earl will be linked to a weak jet stream as pressure builds over the Atlantic ahead of next weekend before entering Britain.
Instead of an early autumn storm, Britons can expect a quiet run through mid-September.
Jim Dale, meteorologist for the UK Meteorological Service, said: “Both hurricanes are going to end up as a wet squib in the Atlantic, with neither really reaching the UK.”
“Danielle will push south at the start of the week as Earl dies out over the Atlantic and instead encourages a region of high pressure to build that could encroach on the UK.”
“What this means is that after a warm start to the week, with temperatures raised by air drawn in from the south, it will then become cooler and drier, and largely stabilized.”
Showers will settle into today, becoming heavier in Scotland and Northern Ireland this evening, according to the Met Office.
Temperatures will also start to rise, hitting 20C in places, according to Met Office meteorologist Aidan McGivern.
He said: ‘Many places will see sunny spells on Sunday, and a shower or two cannot be ruled out.
“Later on, parts of western Scotland and Northern Ireland will see outbreaks of heavy rain.”
“Temperatures will reach the 1920s and 20C, and rain west and north-west across Scotland and Northern Ireland on Sunday evening.”
“These will turn into showers on Monday and eventually end up in the south on Tuesday.”