Natural Resources Wales is asking people to remain vigilant as heavy rain and strong winds will continue to affect Wales through into tomorrow (Christmas Eve).
While most parts of Wales will experience heavy rainfall at some point, the worst affected areas are expected to be across the whole of south Wales, west and mid Wales.
Following prolonged periods of heavy rainfall over the weekend, the ground remains saturated, meaning that further rainfall will quickly find its way into rivers and streams.
There is also a risk that leaves and other debris, brought down by strong winds, will block drains causing flooding of road surfaces.
People travelling over Christmas are advised to allow extra time as driving conditions may be difficult.
Large waves caused by the strong winds are expected tomorrow along the west Wales coast and Natural Resources Wales is advising people be careful when out and about.
It is also asking people to take care near fast-flowing and swollen rivers over the holiday period.
People are advised to keep an eye on local news and weather forecasts for news of any disruption in their area, and are reminded of the dangers of driving through flood water.
Officers from Natural Resources Wales are will be monitoring forecasts closely over the coming days.
Teams are continuing to check that flood defences are in good working order and that rivers are clear of debris which could restrict river flows.