Two children were among four people rescued from a car after it was swept into a river following heavy rain.
The children and two adults escaped through the roof of the car with the help of fire crews at about 18:20 BST.
All four were checked by paramedics at the scene, near Cae'r Odyn Woods, Cilcain, Mold, North Wales Fire and Rescue Service said.
More than 60mm (2.3in) of rain fell in parts of north Wales overnight - June typically sees about 85mm (3.3in).
Earlier on Wednesday, another driver was rescued from his van and people had to be evacuated from their homes.
Firefighters from Wrexham responded after reports a van driver was stuck in his vehicle on Cefn Road at 06:00, while crews evacuated seven properties in the Bagillt Road area of Greenfield, Flintshire, at 06:50.
A Met Office weather warning for rain in north Wales is in place until Thursday.
The basement of Welshpool Town Hall and adjacent shops and houses were flooded.
The River Alyn burst its banks at Rossett, Wrexham, where it was recorded at its highest level - 2.11m (6ft 10in) - since a new gauge was installed in 2010.
The Alyn pub, next to the river, was under water. Duty manager Becca Pierce said fences had been put up, but the flooding was only affecting the garden.
"It is probably going to get worse. It is very different from what it is normally like. I've worked here for about three years and I have never seen it like this," she said.
A number of rail services were also affected by flooding, Transport for Wales said, and passengers were told check the status of services before travelling.
The A525 Bangor Road in Wrexham was shut while sandbags were issued to properties along Westbourne Avenue in Rhyl.
The A548 was closed in both directions between Mostyn and Bagillt, as well as parts of the A541 and A55, Flintshire council said.
Denbighshire council reported a "significant" number of issues and road closures, including the A5 between Corwen and Ty'n y Cefn and roads around the village of Dyserth.
North Wales Police advised people to take care in hazardous conditions on the roads.
Meanwhile, firefighters had to pump water off the A539 at Llangollen, and at the Ty Canol Caravan Park off the A5, near Llangollen.
At the caravan park, water from the hillside ran into a pond and caused it to overflow, but no properties were affected.
Residents on Hamilton Avenue in Sandycroft, Deeside, faced a nervous wait after placing sandbags to protect their homes from further flooding.
Kelly Holland, 32, will spend this evening in a hotel with her family.
"We've used sandbags to try and stop the water getting in so we just hope we'll come back tomorrow and it will be OK," she said.
After alot of effort by ourselves @WelshpoolFire @NewtownFireStn @LlanfairFire @LlanfyllinFire and supported by @stwater the incident in Welshpool has finally been closed and all water pumped out of affected properties, got to say the teamwork was faultless 🚒🚒 pic.twitter.com/YvDL9jeL4n— Montgomery Fire Stn (@MontyFireSTN) June 12, 2019
Adele Quinn said about 50 homes had been affected.
"There's been a community effort to help each other," she said.
There is one flood warning and multiple flood alerts covering north and mid Wales with more rain forecast on Thursday.