Traffic between England and Wales has been diverted over the M4 Prince of Wales Bridge, while National Rail issued a warning that “poor weather” could affect South Western Railway services until the end of Tuesday.
An amber warning for rain is in place for south Devon, much of Dorset, southern Somerset and south-east Cornwall until 09:00 GMT on Tuesday, where 30-50mm of rain could fall widely with up to 60-80mm over the higher ground of south Dartmoor.
Sections of several roads in Dorset, Somerset and east Devon have been closed due to flooding, with dozens of flood warnings in place across the south-west.
A yellow warning for wind covers Cornwall, south-west Wales and parts of northern Devon until Tuesday afternoon. Several flood alerts are also active across Wales, with Gwent Police saying that the A40 was flooded between Abergavenny and Raglan.