Met Office forecasters said that an area of high pressure building from the Atlantic into the south and southwest of England will bring rising temperatures with some areas expected to reach low or even mid-30sC by the end of next week.
Steve Willington, Met Office chief forecaster, said: “We could see parts of the UK entering heatwave conditions if the above-average temperatures last for three days or more.
“Many areas of the UK, especially the south will witness temperatures several degrees higher than average, but these values are likely to be well below the record-breaking temperatures we saw in mid-July.
He added: “As the high pressure builds there is very little meaningful rain in the forecast, especially in those areas in the south of England, which experienced very dry conditions last month.
“Elsewhere in the UK, such as in northern England, Scotland and Northern Ireland, rain-bearing weather fronts will make limited headway against the high pressure, bringing some rain to northwestern parts of the UK.”
The Met Office update comes after supplier South East Water announced that it will introduce a hosepipe and sprinkler ban on homes across the south of England, affecting around 2.2 million customers in Kent and Sussex.
It will be in place from a week on Friday and will remain in place until further notice. Parts of Hampshire and the Isle of Wight had already been hit with bans amid fears of drought.