A spokesman for the Environmental Agency said: “Working with partners in local resilience forums, Environment Agency teams have been out on the ground clearing waste grilles and screens, and stand ready to operate flood defences if needed.
“They are also ready to support local authorities in their response to surface water flooding.
Meteorologists have warned parts of southern England could see highs of 70mm if the “intense” downpour continues at its current rate.
Annie Shuttleworth, a meteorologist for the Met Office, said that as the rain moves north-eastwards throughout Tuesday, areas of the Midlands and north-east could see 40mm of rain.
She added that the rain is set to ease in the south on Tuesday afternoon, with a “low risk” of thunderstorms to follow.
Ms Shuttleworth said: “We have seen the main body of rain move further north throughout the morning, and the rain will persist for the longest in north-eastern parts of England.”
Wednesday will bring drier weather across the UK, which is set to stay fairly settled with patchy sunshine predicted throughout the coming days.
Tuesday temperatures of around 18C (64.4F) in London and 15C (59F) in Edinburgh will climb to around 21C (69.8F) and 18C (64.4F) respectively on Wednesday, Thursday and Friday.
Meanwhile, temperatures in Cardiff and Belfast are predicted to remain constant at around 18C (64.4F) throughout the working week.
The long-range forecast for September is uncertain, but forecasters expect temperatures across the UK to be slightly higher than average for the time of year.