19 July 2016 Last updated at 12:42 BST
A heatwave in Spain and a strong breeze could be bringing the hot weather north to the UK. This is called a Spanish plume.
This could also mean hot and humid storms later this week.
We spoke to our resident weather expert Simon King to find out more...
Glorious sunshine and temperatures of up to 35 degrees in parts of the UK, but what is causing it?