A warm, muggy and dry night ahead.
Staying clear, dry and mild tonight.
The Met Office has issued an amber warning for rain in the capital, with torrential downpours expected across the south east of England.
Thunderstorms in the UK are affecting our flights today causing delays & cancellations. Info here http://t.co/T4a5gC7CdW [07:36 19JUL]
One in five flights will be cancelled during a two-hour period at Heathrow today due to thundery weather, the airport has said.
A spokeswoman said: "There is severe weather forecast at Heathrow with a 70% risk of thunderstorms, lightning strikes and hail storms. During thunderstorms the number of aircraft that can take off and land each hour is reduced.
"We have therefore requested that airlines reduce their flight schedule by 20% between 4pm and 6pm. Passengers due to travel on July 19 are urged to check the status of their flight with their airline before travelling to the airport."