The weather warnings will be in place until Thursday, and the dire weather could cause travel chaos for thousands, according to reports.
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"Where flooding occurs, there is a slight chance of delays or cancellations to train and bus services," the Met Office warned as quoted by the Express.
Heavy #rain will cause disruption this afternoon across London and parts of southeast England, with flooding likely in places as well as travel delays. Stay #WeatherAware pic.twitter.com/SJddGNnXyd
— Met Office (@metoffice) June 10, 2019
Heavy rain is expected to hit east and southeast England at first, and it later it could spread slowly to north and west through the day to reach parts of Wales and northern England.
Up to 50mm of rainfall is predicted to hit some parts of the UK.