Weather prompts road hazard warning for Wales
Motorists have been urged to take care on the roads as heavy rain makes driving hazardous.
Environment Agency Wales said the downpours were making conditions on the road "difficult", while highways agencies reported reduced visibility.
The Met Office is warning people of the possibility of localised flooding with more wet weather forecast.
Thousands of rugby fans in Cardiff for the Wales v New Zealand match faced warnings of road and rail delays.
South Wales is likely to bear the brunt of the heavy rain, with downpours getting worse through the evening, forecasters said.
More wet weather is expected on Sunday.
Jeremy Parr, flood risk programme manager for Environment Agency Wales, said the ground was already very wet following heavy rain and flooding on Thursday.
"It's going to be difficult driving conditions for sure," he said.
"River levels could rise. So very much the advice is stay away from rivers and also standing water on roads.
"Everybody who's made a journey in cars over the last couple of days knows how bad it's been and our advice is not to drive, certainly don't drive through any rain water as you never know how deep it is.
"You can get stuck."
'Prepared for problems'
Cardiff city centre was set to be busier than usual on Saturday with Christmas shoppers expected and a 74,500 sell-out crowd at the Millennium Stadium for the rugby, which kicked off at 17:15 GMT.
But Cardiff council said it was prepared to deal with any problems.
"With more bad weather forecast following some of the localised flooding we saw on Thursday night, I have asked the chief executive to ensure plans are in place to equip the council to deal with issues that may arise," said councillor Ashley Govier, Cardiff council's cabinet member for environment.
"This includes bringing in extra resources to help our flood team."
Arriva Trains Wales said the rail network could potentially be affected by flooding and services may be delayed or cancelled at short notice.
It urged people to check the status of their journey online before travelling or by ringing National Rail Enquiries.
The Environment Agency has two flood alerts in place, but no flood warnings.
The Met Office weather warning follows Thursday's high winds and heavy rain which left homes and businesses flooded.
Motorists were also badly affected and traffic was brought to a standstill as the A55 in north west Wales closed.
The clean-up is continuing and Gwynedd council has put its gritting team on standby.
"Due to the possibility of further extreme weather over the weekend which may involved standing water on roads turning to ice, we have put our gritting teams on standby," said Gareth Roberts, Gwynedd council's environment cabinet member.
"We would urge motorists to check the weather reports before embarking on any journeys, especially at night, and to proceed with care," he added.
Members of the public who experience difficulties as a result of the weather can ring the council's contact centre, Galw Gwynedd, on 01766 771000.
- Lakes, Rivers & Sea
Temperature tab only