Yellow weather warnings for rain and wind have been issued for large parts of the UK with disruption to travel and flooding likely.
Over three inches of rain could fall on the worst-affected regions over the period, with further rain possible in areas which were hit by floods.
Winds of up to 60mph could also batter exposed areas of high on Sunday, the Met Office has said.
The Met Office warning for rain covers southern Wales and the south of England beginning from 4pm on Sunday until 9am on Monday.
Areas on the higher ground of Dartmoor, south Wales and the Dorset Downs could see 50-80mm of rain, with the most exposed areas potentially set to see winds of 60 mph on Sunday and Monday.
Disruption to travel including road closures, public transport delays, and issues with coastal roads are expected with travellers urged to check before they make a journey.
Met Office chief meteorologist Jason Kelly said: “Sunday will bring a return to wet and windy weather across the southern half of the UK. A warning for rain has been issued for southwestern England and south Wales from 1600 on Sunday through to Monday morning.
“Within the warning area 20-30mm of rain is expected quite widely, with up to 50-80mm possible over the higher ground of Dartmoor, south Wales and the Dorset Downs.”
Warwickshire County Council warned motorists planning to travel over the weekend on X saying: “Heavy rain is causing travel issues across the county.”
“If you’re out and about today, please don’t drive through flooded roads, as the water could be deeper than you think,” it added.
The yellow weather warning for wind stretches from coastal areas stretching from Plymouth up to the majority of the Welsh coastline from 9am to 11.59pm on Sunday.
“A yellow warning for wind has also been issued from 0900 to midnight on Sunday,” the Met Office said.
“The area covers the far southwest of England and western Wales. Gusts of 50-55mph are likely within the Yellow warning area, up to 60mph is possible in the most exposed coasts and areas of higher ground.”
Through Monday as the area of low pressure clears to the east, further rain will sink south and will once again descend on areas already hit by heavy rain in the Midlands. The Environment Agency has issued flood warnings – meaning flooding is likely – for 48 locations across the area.
A further 89 flood alerts – meaning flooding is possible – are issued for 89 locations across the Midlands. The Environment Agency said roads and some properties will flood and there will be travel disruption.
Northampton, Bristol, Plymouth and Weymouth are among the areas most likely to be the worst affected by flooding.
The fresh front of rain follows amber warnings for rain which saw some of south and central England have experienced 250 per cent of their average September rainfall.
The heavy rain may extend into Tuesday in some eastern and southeastern areas, before conditions take a turn to be brighter and drier towards the middle of the week.
However, there are signals for the potential of further wet and windy weather towards the end of next week.
On Saturday the railway line between Swindon and Bristol Parkway was blocked due to flooding, forcing passengers to divert their routes as they faced delays of up to 30 minutes.
