Britain is set to be warmer than Istanbul this week as the fall from Hurricane Sam will bring temperatures of 21C.
Five days of Indian heat will result in warmer weather this weekend – but only after a second 60 mph storm will engulf the country tomorrow.
After the first major storm of autumn on Saturday, another Atlantic storm will bring more washouts and thunderstorms on Monday.
But then Hurricane Sam moving near Iceland will suck warm subtropical air northward.
BBC Weather has forecast a jump of 20C from Thursday to Monday.
Up to 21C – 6C above average – in some places, Istanbul is expected to warm to over 19C.
The Met Office said dry conditions were due for many people, with fog for some, although some rain and wind conditions would be seen over the northwest.
Met Office forecaster Marco Petagna said: “The storm may have had some good effects – as Sam drives warm air northwards, allowing higher pressure to settle things over much of Britain.”
A meteorological forecaster said: “More rain falls on Monday, and in the evening comes wet and windy weather in the southwest.
“Rain, some heavy and coastal thunderstorms will affect England and Wales on Tuesday.
“From Wednesday it will become warmer and more stable, with temperatures expected to remain above average through the weekend, with sunny weather and fog throughout the night.
“But unstable conditions are forecast in the northwest with clouds, rain and some strong winds.”
John Hammond, former BBC and Met Office forecaster, said: “There will be talk of an Indian summer if Sam brings warmer southerly winds and a marked rise in temperatures our way.”
The heat will come next week after more rain from tomorrow starting from the first week of October.
Andy Page, chief meteorologist for the Meteorological Department, said: “The weather will be under low pressure in the coming days, with strong winds and heavy rain at times.
“Further coastal thunderstorms are possible to the south and west late Monday and Tuesday as another weather system moves from the Atlantic.
“There are great uncertainties around the track of this system, but it currently looks like it will bring more heavy rain and strong winds to parts of Wales and southern England.”