Temperatures could peak at 16C over the weekend – well above the average highs for November, amid a barrage of heavy rain and 50mph gale force winds.
Daytime temperatures this time of year often dip as low as 4C in parts of the UK – and rarely ever climb above 10C.
But the strange Indian summer, which started last weekend with balmy 18C heat and bright sunshine, is set to continue in the coming days.
However, the tranquility felt on Thursday, with light breezes and mild warmth, is unlikely to be repeated and any surges in temperature will come amongst rampaging winds and torrential downpours.
And it wouldn’t be Friday the 13th without some cloudy skies and overnight a menacing band of rain has been moving in.
BBC forecaster Stav Danaos said: “We’ve got another band of heavy rain, quite squally, spreading its way slowly eastwards across the country.”
In the early hours it has passed through parts of Northern Ireland and Scotland and is arriving in northwestern England and Wales.
“Some of the rain is quite heavy, strong winds on it…Ahead of it, dry and windy, but mild behind it – we’ll see lots of blustery showers pushing into the northwest of the UK,” the forecaster continued, referring to Friday morning.
However, once that clears, “another bright day” is on the cards, “with sunshine and showers”, with the heaviest rain largely in the centre and northwest of Britain.
“It’s brighter for all, but lots of showers will continue to pile into Northern Ireland, western Scotland and some of them will be heavy and perhaps even thundery,” said Mr Danaos.
“It will be windy too, the northwest of Scotland, 40-50mph gusts, fairly blustery, but not quite as strong further south.”
Temperatures in the south could reach 14 or 15C but most will be hovering around 10-13 degrees, according to charts.
The return of low pressure means a far more unsettled weekend, with a squeeze in the isobars in the south, particularly on Sunday.
Though some charts show highs of 16C for Saturday afternoon.
“An unsettled weekend, windy, especially in the south, mild on Saturday, bit cooler on Sunday – but there will be some sunshine,” added Mr Danaos.
Some forecasts suggest plummeting temperatures later this month, with snow on the cards and December possibly colder than normal in a big winter freeze.
UK 5 day weather forecast
Band of rain, heavy in places, over central areas moving east, to clear the far southeast early afternoon. Many southern and eastern parts then dry with sunny spells, with scattered showers further west, these heavy in the northwest where windy.
Showers in the north, dry elsewhere, but thickening cloud bringing outbreaks of rain to the south and west later. Mild in the south, chilly in the north.
Bright in east at first, but mostly cloudy with rain at times, heavy in the west. Rain clearing to sunny intervals and heavy showers in the west later. Windy.
Outlook for Sunday to Tuesday:
Limited bright spells on Sunday with periods of heavy rain for many. Further rain in the west early next week, drier elsewhere and turning milder. Often windy with coastal gales.