The Met Office has issued a yellow alert for rain, ensuring the public to "be alert" of potential torrential downpours today.
A Met Office forecaster said: "Isolated thunderstorms with very heavy rain, hail and gusty winds are possible later this afternoon and early evening.
"The public should be aware of the risk of very localised surface water flooding, particularly if the thunderstorms affect urban areas".
"These could produce 30 mm of rain in less than an hour, large hail and also squally winds".
More top news
One lucky Londoner is (apparently) being offered the chance to live rent free in an £8m penthouse Paddington.
Khan said sorry for using the racial slur 'Uncle Toms' during a television interview in 2009.
Clear skies overnight allowing temperatures to fall. Lows of 4C.