A yellow weather warning for rain has been placed on Devon and Somerset from 4pm on Sunday (September 29).
The Met Office says that further heavy rain is likely to cause some travel delays and flooding on Sunday evening from 4pm, through the night until 9am on Monday (September 30).
Residents should be prepared for some disruption to power supplies, spray and flooding on roads probably may also make journey times longer
Bus and train services will also probably affected with journey times taking longer and flooding of a few homes and businesses is likely.
A spokesman for the Met Office said: "Rain is expected to develop across southwest England and south Wales during Sunday morning, moving slowly east before rain gradually eases from the west during the second half of Sunday night.
"Much of the warning area is likely to see 20-30 mm fall over 9-12 hours, though some places may see 50-80 mm. These higher accumulations are most likely across higher ground in south Wales, Dartmoor and the Dorset Downs."
They added that this warning has a medium likelihood and a low impact.
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