11am: The Met Office warned that there will be lots of “hot sunshine” across the UK while temperatures will be a degree or two hotter than yesterday for many.
The Met Office tweeted: “If you are heading out today to enjoy the summery weather be aware both pollen and UV levels are high or very high for many.
“For most, we start this morning with temperatures already at the average maximum for June – it’s going to be another hot one!”
10am: Temperatures across southern Britain are forecast to soar into the mid 30Cs today with highs of up to 22C (71.6F) in the north.
9am: The Met Office ramped up a level-2 heat health alert to level-3 warning of a 90 per cent chance of heatwave conditions until Wednesday.
Forecaster Charlie Powell said: “The big thing this week is going to be the hot and very summery weather.
“We are talking about heatwave conditions and we have a heat health watch in place until Wednesday to reflect this.
“There is no real sign of any rapid change in the weather4 as we head through next week and into the weekend.
“Monday is likely to see the peak of the heat with highs approaching the mid 30Cs challenging the hottest day of the year so far.”
8am: RAC traffic watch spokesman Rod Dennis said: “A lengthy spell of hot weather raises the prospect of softening roads on some parts of the network.”
7am: Met Office chief meteorologist Andy Page said the south of England will hot into this week due to high pressure from the south west and warm air drawn up from the Azores.
He said: “It’s likely that the very warm weather will continue across southern parts of the UK, although it could turn more unsettled later in the week with a risk of some thundery downpours.”