The bank holiday weekend is set to be a washout after torrential downpours battered parts of the UK.
The Environment Agency (EA) has warned of widespread flood risks with up to an inch of rain falling in some places.
Heavy showers hit most areas of England and Wales, forecasters said, while thunderstorms caused travel problems in the Midlands and southern parts of England.
Claire Austin, a forecaster with MeteoGroup, the weather division of the Press Association, said: "We've seen heavy downpours and some pretty nasty weather. The heaviest and most frequent rain has been across the Midlands and southern parts of England in London and East Anglia."
The heaviest downpour was recorded in Kew Gardens, west London, where 18mm of rain fell in just one hour on Saturday afternoon, Ms Austin said.
The EA issued eight flood alerts across the country and one flood warning - the second highest alert which means flooding is expected - for Hebden Bridge, West Yorkshire, after heavy showers caused rising river levels.
Four flood alerts - the lowest level of warning which means flooding is possible - were issued in the North West for the rivers Calder, Lune and Ribble. Alerts were also given for the Lower Dove Brooks, in Staffordshire, the River Calder and its tributaries from Todmorden to Brighouse, in West Yorkshire, and in the South East following increasing river levels between Ringwood and Christchurch. So far the EA has not issued any severe flood warnings - the highest alert when there is a danger to life.
The bad weather caused a number of transport problems across the country. Train delays were reported after lightning damaged signalling equipment in Solihull, West Midlands, Cleethorpes, in Lincolnshire, and at London's Cannon Street station. Flooding also caused trains to be suspended between Fulwell and Shepperton, in Middlesex. Transport for London said flooding had forced the closures of Covent Garden and Lambeth North stations. Gloucester Road station was also closed on the Piccadilly line while Aldgate station was shut anti-clockwise on the Circle line. Shoppers in Cambridge reported that a number of shops in the city centre had to close temporarily due to flooding.
The wet weather affected the day's football as Sunderland's Premier League clash against Reading in Wearside was called off due to a waterlogged pitch. Wycombe's home match with Bristol Rovers was also abandoned after 66 minutes due to standing water on the pitch.
After Saturday's heavy rain, forecasters have predicted Sunday will be drier with a risk of showers in northern and eastern areas, before rain returns from the west early on Monday. It is expected to spread to most areas, though the South East and East Anglia might escape some of the worst of the conditions. Temperatures are not expected to reach much higher than 20C (68F) over the weekend - a stark contrast with last weekend when the thermometer touched 32C (90F).