The Met Office said spray and flooding could lead to hard driving conditions and some road closures, and there was a small chance homes and businesses could be flooded.
The severe weather warning comes just a week after the hottest April day for 70 years, when temperatures hit nearly 30 degrees Celsius.
The Met Office has issued a yellow warning for rain for the entirety of the Sussex and the south east, with heavy downpours expected to reach our doorsteps by 9pm tonight.
While temperatures will stay above freezing for most of us, strong northerly winds and coastal gales will leave it feeling cold.
Trains and buses could also be affected with the Met Office warning of possible delays or cancellations.
There are even concerns more snow could be on the way - although nowhere near on the same scale as when the Beast from the East hit in March.
A spokesperson for The Weather Channel said: "A low pressure cell will pass over the south of the British Isles and the extreme north-west of France with showers, or longer spells of rain on Friday".
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Daytime temperatures will struggle to reach 5C (41F) and the Met Office says the rain will also be accompanied by a bitter wind, warned the Met Office.
'The April average for rainfall in southeast England is around 50mm so there will be some places that top that within 24 hours, so that's we're concerned, ' she said.
The BBC forecaster said: "It is going to be a pretty cold, wet and windy day".
'We are expecting impacts from this type of weather - once it arrives, it's stuck with us all day'.
But there is good news on the horizon.
It all comes just a week after Britain basked in handsome sunny weather. including warnings handed out to hose running in the London Marathon to take care because of the high temperatures.
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