The Met Office has issued a stark warning: an amber extreme heat alert for 34C temperatures is now in place, with the Midlands and Yorkshire bracing themselves for the worst of it. The scorching heatwave has already left many areas sweltering under 32-35C sun.
A yellow weather warning for heat is also in effect across England, Scotland, Wales, and Northern Ireland, with the Met Office cautioning that even a few days of intense heat can be disastrous for vulnerable individuals - including pensioners and young children. They're at risk of serious health problems if they don't take precautions.
The hottest day of the week is expected to be Wednesday, when temperatures could peak at 34C in certain areas. And it's not just daytime temperatures that are causing concern: overnight lows will remain unseasonably high, ranging from 18-22C across the UK.
The Met Office says a stubborn high-pressure system is driving this heatwave, and residents must take steps to stay safe - drink plenty of water, avoid exhausting activities, and keep an eye on neighbours who may struggle in the heat.