The heat has caused fires, travel disruption and power cuts.
Emergency services in South Yorkshire, East Yorkshire and North Yorkshire issued "major incidents".
Yorkshire Water has announced a hosepipe ban as a result of the continued dry weather.
In a statement issued by the company, it revealed that parts of Yorkshire had seen the lowest rainfall since records ban more than 130 years ago.
7. August heatwave
Taking colourful cover from the hot sun in Scarborough's North Bay. The Met Office is warning people vulnerable to extreme heat that they are likely to experience 'adverse health effects' while 'some changes in working practices and daily routines' are likely to be required, according to the forecaster Photo: staff
8. August heatwave
Members of the public out enjoying the warm weather in Roundhay Park, Leeds Photo: staff
9. August heatwave
Helen Lord, of Wakefield, with friend Suzanne Newlove, of Leeds, sitting under the trees during the midday sun whilst in Roundhay Park, Leeds Photo: staff
10. August heatwave
Lindley Wood Reservoir near Otley, is the oldest of the reservoirs in the Washburn Valley. It was Built between 1869 and 1876. At the moment due to the ongoing lack of rain fall and the extreme heat the UK is experiencing right now this reservoir is completely drying up. Photo: staff