Storm Callum is expected to cause further disruption on Saturday as the UK continues to be battered by heavy downpours.
An amber warning for rain remains in place for parts of south Wales until 6pm, with further flooding and power cuts likely.
A yellow warning covers much of the rest of Wales, as well as parts of Scotland and the north west and south east of England.
Thousands of households were left without power and dozens of flights grounded on Friday as torrential rain and winds of more than 70mph buffeted the Republic of Ireland, Northern Ireland and the west coast of Britain.
One part of south Wales, the Brecon Beacons village of Libanus, recorded 182mm of rain in just 48 hours – way above the monthly total for the region of 169mm.
Forecasters are warning of more of the same over the weekend, although some parts of England will escape the worst.
Met Office meteorologist Helen Roberts said: "There will be more wet and windy weather for similar parts of the country – predominantly western areas – which could cause more flooding.
"The east and south east of England will see the best of the drier and brighter weather, where it will be even warmer than yesterday and could reach 25C – way above average for the time of the year."
Overnight, several police forces reported accidents on the roads due to surface water, while Network Rail said it was expecting disruption to train services throughout Saturday and advised passengers to plan ahead.
The Environment Agency has issued flood warnings for parts of the Dorset coast, as well as 58 flood alerts across England, while Natural Resources Wales has 28 flood warnings and 39 flood alerts in place.
Storm Callum was named by Met Eireann and is the third named storm of the season to hit the UK.