The Met Office has issued a yellow warning of rain to hit the south and London areas into Monday afternoon (May 29).
The warning includes Greater London and is active from 12pm on Sunday May 28 until 4pm on Monday.
According to the Met Office's latest weather forecast for Sunday May 28, this unsettled weather could mount to downpours, thunder and lightening which could cause flooding, power cuts and travel disruptions.
The forecaster said: "Some areas of heavy rain will move north-eastwards during Sunday and into Monday across parts of southern England and Wales with some locally torrential downpours and thunder possible.
"Many areas will see rain at times but the extent of the most intense and thundery downpours will be limited."
"This could result in some disruption, with sudden flooding of roads, transport routes, homes and businesses possible locally.
"Frequent lightning in association with the heaviest rain may also temporarily disrupt power supplies."
However it was reassuringly added that "given the hit and miss nature of the heavy rain and thunderstorms, many places will likely see little or no impacts."
It is predicted that such unsettled weather will start around midday Sunday to around 4pm on Monday (May 29).
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