The shift in weather is due to an area of low pressure bringing rain and cool air from the Atlantic.
It comes after a sweltering three-day stretch in which temperatures soared well above average with 34.7C in Astwood Bank, Worcestershire, on Friday, 33.1C in Cardiff on Saturday and 31.2C in Achnagart in the Scottish Highlands on Sunday.
But effects of the heatwave are still being felt with another hosepipe ban announced.
Thames Water said on Monday the ban affecting parts of southern England will start from 00:01 on 22 July.
It restricts non-essential hosepipe use – such as watering gardens, washing cars, or filling paddling pools – as reservoir levels drop due to a prolonged spell of dry weather.
The first hosepipe ban of the year was introduced on Friday, following the warmest June for England and the driest and sunniest spring in over a century.
The announcement comes just as amber and yellow heat health alerts from the UK Health Security Agency and the Met Office expire across England.
The alerts warned of pressure on health and care services.
