A weather warning has been issued for Cornwall for Monday, meaning three of the next four days are now expected to see extreme weather.
The first warnings, issued by the Met Office, are for Friday evening and Saturday morning, when a band of rain, torriential at times, is expected to sweep across the region.
A further period of rain is expected to affect the county on Monday, with more heavy rain expected to fall onto the already saturated ground.
It means localised flooding is likely, with disruption to travel during the busy pre-Christmas period.
A spokesman for the Met Office said: "Another intense area of low pressure is expected to track close to the UK during Monday.
"Associated rain and strong winds may again affect southwestern parts of England which remain saturated following earlier heavy rainfall.
"The public should be aware of the increased risk of localised flooding and possible disruption to transport. This warning is likely to be updated over the coming days."