The Met Office has issued a yellow weather warning for rain covering London, the South and Wales on Wednesday.
Heavy rain is expected to cause travel disruption and flooding, with thunderstorms forecast in some areas.
Forecasters say we could see as much as 60mm of rainfall between the early hours of Wednesday morning and the afternoon, with the weather warning in place until 2pm.
They have also warned coastal gales are “likely” along English Channel coasts, saying people should prepare for “heavy rain and strong winds”.
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