After a slightly fresher start to the week temperatures are set to climb, returning to 32 or 33C (90-91F) in southern England by midweek.
Many parts of Scotland, Northern Ireland, Wales and England will get into the mid to high-twenties.
It means heatwave conditions are likely to continue for several more days in places, probably reaching a total duration of two weeks in a few locations.
Northerly winds should bring slightly lower temperatures by the weekend – albeit still above the seasonal norm, with a chance that heatwave thresholds could still be met in the south.
You can keep an eye on the forecast highs where you are – as well as the all-important chance of rain – by checking the BBC Weather app.