South Wales Fire and Rescue Service have sent firefighters to several flooding incidents to help deal with the bad weather.
Firefighters are currently in attendance in the Cathays area of Cardiff and Mill Parade and Commercial Road in Newport.
Update International food market Newport: crews using 2 ejector pumps to remove Approx 1m of water from the stock room
Update Mill Parade Newport: Crews are using 2 light portable pumps and the water is now starting to recede. council gully sucker also in use
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Cloudy with patchy rain or drizzle, possibly turning heavier for a time.
Organisers say there will be increased security at the Urdd National Eisteddfod, which began in Bridgend today.
Any remaining heavy or thundery showers will clear eastwards this evening.