The Met Office issued yellow weather warnings for the south west of England and Wales as well as south West Scotland, the Borders and Northern Ireland.
Flood warning are also in place from the Environment Agency along the south coast, particularly at high tide when there's a risk of "significant spray and shingle overtopping".
Forecasters say intense bursts of rain, as well as autumn leaf fall blocking drains, will increase the likelihood of disruption to travel as roads could flood making journey times longer.
South West England and South Wales was battered by 30mm of persistent and heavy rain overnight with the threat of an additional 20 to 30mm today.
Temperatures will drop to single digits to as low as 7C, but will reach 12C as the rain moves east.
A Met Office spokeswoman last night said: “Flood warnings are in force for South West England, Southern Wales, parts of Northern Ireland and Scotland.
“There will be heavy rain in South Wales and South West England starting tonight and through to tomorrow morning.
“Local services do risk flooding and there will be disruption to travel and road services.”
The spokeswoman said Brits should expect the conditions to be same in Northern Ireland and Scotland and the rain travels east.
She added: “Later in the day the rain will come to Northern Ireland and Scotland.
“Local flooding is also possible there with disruptions to transport and road services.”
“It is also the time of year when there are a lot of leaves, which can block drains and also exacerbate any risk of flooding.”
However, the eastern part of the country will stay dry and experience mild temperatures of 13C.
A huge, 2000-mile wide 'pressure vortex' will cause major disruptions in the UK from Wednesday, dumping an inch of rain on the country.
The low pressure vortex will disrupt the UK with wet and windy conditions lasting up until next week.
Forecaster John Hammond said: “This week, a huge vortex of low pressure in the eastern Atlantic will see the jet stream fling a succession of wet and windy spells towards UK.
“The potential for disruptive winds needs to be watched.
"Western parts are most prone. Several wet spells are expected.”
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