Parts of England saw almost a month’s worth of rain in 24 hours, causing widespread delays for commuters.
There were reports of flooding across the country on Tuesday, with some areas experiencing more than 55mm of rain throughout the day.
Met Office meteorologist Luke Miall said Swansea in South Wales saw the highest rainfall between midnight on Monday and midnight on Tuesday, with 57.8mm recorded.
Meanwhile, Boscombe Down in Wiltshire experienced 55.2mm of rainfall over the same period – the highest in England.
Mr Miall said the September rainfall average for parts of southern England – which includes Wiltshire – was 65mm, adding: “Some stations in central southern England saw nearly a month’s rainfall in a day.”
Other weather stations in England and Wales recorded between 20mm to 40mm of rain over the same 24-hour period.
London commuters reported flooding and delays as they tried to head home on Tuesday, with footage recorded at Liverpool Street station showing water pouring through the ceiling at the city centre station
Despite the wet weather, Mr Miall said the UK had still not reached its average monthly rainfall for September, which is 96mm.
He said: “Most places are still slightly below the average for where we should be for this time of year, apart from central southern England.
“Counties such as Devon and Dorset have seen more than their average monthly rainfall.”
Mr Miall said Dorset had seen 90.5mm of rain so far this month – above the average of 72.2mm.
The forecast for Wednesday evening is further showers across central and eastern England.
Mr Miall said an area of cloud in the west will result in “another spell of wet weather” moving east across the country overnight.
Thursday is forecast to be a clearer day, but with some blustery showers across England and Wales, and temperatures reaching 21C to 22C.
Mr Miall said wind speeds could reach 30mph on the south coast, and between 15mph to 20mph inland.
The weather is forecast to remain “unsettled” into Friday and Saturday across the country, with more showers forecast, Mr Miall said.