The mercury will begin rising from Saturday as many areas enjoy sunny and dry conditions.
This will eventually give way to a warm spell, with parts of the south expected to bask in 22C heat by mid-week and up to 24C by the next weekend.
According to BBC Weather, temperatures could top the mercury at 25C in the south heading into the following working week.
Met Office forecaster Marco Petagna said temperatures are several degrees above where they normally should be at this time of year.
He said there was a “small chance” the UK could experience a “brief” heatwave as temperatures build into the twenties.
A heatwave is defined as at least three consecutive days of a certain temperature threshold being reached or exceeded. The threshold varies across different parts of the UK and must reach at least 25C in northern England and 28C in London.
Here’s a guide to how the hot spell will affect where you live:
It is expected to be a fine end to Thursday in the northwest, with cloud slowly thickening overnight from the north.
It will stay dry for most, although splashes of rain will move into the far north by dawn. A fairly mild night will be felt by all, with a minimum temperature of 7C.
Friday will get off to a dry start for many, however outbreaks of rain will continue to spread southwards across the region as the day progresses. Drier and fresher conditions will follow by the evening. The maximum temperature will be 17C.
It will be mostly dry over the weekend with warm sunny spells, although a few showers are possible on Saturday.
The skies will turn a little cloudier on Monday, but it will remain dry for most.
Thursday will be a dry evening with occasional bright or sunny spells in the northeast.
Clouds will increase after midnight, with light rain possible towards the end of the night in the west. Minimum temperature 9C.
Friday will be a cloudy and breezy day, with outbreaks of rain spreading southeastwards.
Rain will be heavy and persistent in places, particularly the west.