Heatwave to end with torrential downpours, thunderstorms and flash flooding It's time to ditch the shorts, pick up a brolly and dig out a coat - with a giant fall in temperatures for many. Thursday daytime won't even get to 10C in the North-East, with sub-zero night-time temperatures as low as -2C over higher ground in the North and North Wales, with a chance of frost. The whole country will have single-digit temperatures on Friday night, with Saturday night seeing potential frost as far south as the Peak District and even a touch of ice on car windscreens. Temperatures plummeted today in the North - with parts of North-East Scotland peaking at just 9C, down 19C from Friday's 28C sizzle. The South set to fall from 25C today to 15C by Saturday, as Britain is influenced by high pressure over Greenland and low pressure over Scandinavia. But the Met Office says deluges will dry up in time for the four-day Diamond Jubilee weekend, with most parts dry and recovering through the weekend to 20C or more in the South-East. A spokesman said: "For the Jubilee weekend, from Saturday to Monday, many parts will be dry and bright but feeling cooler than of late. The East, and in particular North-East coastal areas, and possibly the South-West, could experience more cloud and a few showers. Temperatures will be around or just below average. From Tuesday, it will should become gradually more unsettled. The South-East may hold onto the driest weather for longest.