Wednesday is likely to be the hottest day of the year so far, with temperatures soaring to 33C (91F) in certain parts of the UK and Scotland could see temperatures in the high 20s.
Scotland’s hottest day of the year so far was June 11 when Aboyne in Aberdeenshire hit 23.8C, however, that should be comfortably beaten this week.
A Met Office spokesman said temperatures will rise today, tomorrow and Wednesday but drop again on Thursday when severe thunderstorms are likely to hit central and western parts of the country, before climbing again ahead of the weekend.
The heatwave is caused by a warm front and tropical continental air mass from Europe pushing across the country – bringing with it high temperatures and humidity.
Coastal areas will be cooler, but Northern Ireland and Scotland will still experience temperatures in the mid to high 20s.
The UK’s highest temperature so far this year was recorded at Gravesend – where the mercury rose to 27.8C (82F).
A Met Office spokesman said: “There is a plume of heat that is going to push towards the UK from Tuesday and beyond.”
The hottest ever temperature in Scotland was 32.9C and although forecasters are not expecting temperatures quite that high this week, Scotland should reach at least 28C on Wednesday.
While record temperatures are expected through the day, forecasters are also predicting unusually high temperatures through evenings this week.
Warmer temperatures this week means it'll feel very humid at night. Here's a look at 10pm tonight #UKheatwave pic.twitter.com/bTs7MU7Soa
— Met Office (@metoffice) June 29, 2015