Parts of England and Wales are likely to continue to be hit by heavy showers after Friday's flooding.
Friday's flooding caused chaos in parts of England
Twenty-seven flood warnings - one of them severe - are in force, and Met Office severe weather warnings, taken down earlier, may be reinstated.
Rescue teams have joined a search for a 17-year-old soldier, swept away while on an exercise in North Yorkshire.
The emergency services received hundreds of calls with people trapped inside cars and homes by flash floods.
Some areas saw their average monthly rainfall come down in just 24 hours.
The International Rescue Corps has joined police and military in the search for a soldier, missing for more than 24 hours.
He was one of three soldiers who fell into Risedale Beck river near Catterick Garrison in North Yorkshire - the other two were rescued by RAF helicopters.
The 12-strong rescue team were using boats and specialist heat-seeking equipment in the search.
Flood warnings remain in place in Anglia, the Midlands, north-east England, north-west England, the Thames area and Wales.
A severe flood warning - indicating "extreme danger to life and property" - is in place for parts of the River Don.
BBC weather forecaster John Hammond said a respite from the heavy rain on Saturday morning would be followed by more showers, and there remained a possibility that severe weather warnings could be reinstated.
However, he added: "The showers today will not be as prolonged or intense as on previous days, so the worst should be over."
Heavy rainfall early on Friday morning caused havoc, with 100 people trapped by flood water at a factory in Sutton Coldfield in the West Midlands.
Fire crews rescued most of them as water levels rose to 6ft in places, but 40 stayed until the water receded.
Meanwhile, a major clean-up operation is under way in the Aston area of Birmingham, where 200 homes were deluged when the River Tame burst its banks.
Mid and West Wales Fire Service said they had been called to a number of flooded homes - the worst-affected areas being Borth, Lampeter and Aberteifi.
There were several road accidents, one in which a 57-year-old man from Gloucester broke his leg after his car hit surface water and overturned on the M42 in Warwickshire.
In Sheffield and Barnsley 14 schools were closed and a nursing home in Sheffield was evacuated.
In the Chapeltown area of Sheffield, a 14-year-old boy had to be pulled from a swollen river.