The Met Office has issued a yellow weather warning for rain from midnight on Sunday until 11pm on Monday. That means there is the risk of localised flooding and surface water on the roads leading to difficult road conditions.
It's due to a band of heavy rain, accompanied by strong northeasterly winds, affecting the south and south-east through Sunday night and at times during Monday.
The heaviest of the rain will clear from the south-east during the morning, but further heavy, slow moving and potentially thundery showers are likely to occur.
Workmen are at a Hampshire primary school to cut down a tree after it was hit by lightning.
A roof at Potley Hill Primary School was also struck by lightning this afternoon.
A primary school in Yateley has been closed after a lightning strike this afternoon.
A tree and roof at Potley Hill Primary School were struck and all pupils have been sent home.
The Met Office has issued a yellow warning for South East and London and warn people to expect heavy rain and thunderstorms.
People across the South have been told to expect localised flooding and surface water could lead to difficult driving conditions.
The Met Office have also issued hail and lightning warnings locally.
The showers are likely to break out across Southern England early on Tuesday afternoon and finish on Tuesday evening.
Today:Cloud and showery rain in the east soon clearing then a much brighter day in prospect with some sunny spells but still a few heavy showers around, mainly near Channel coasts. Still breezy. Maximum Temperature 11 °C.
Tonight:Mostly dry at first, but cloud and outbreaks of rain, locally heavy, spreading across the region for a time followed by a few heavy and blustery showers. Becoming windy. Minimum Temperature 6 °C.
Friday:Some sunny spells but also occasional heavy and blustery showers, and becoming very windy again. Maximum Temperature 11 °C.
Saturday, less windy, but with some rain or showers. Dry at first on Sunday but becoming wet and very windy later. Very windy Monday with blustery showers.
The Met Office has issued another severe weather warning for tomorrow after the region has just recovered from the turbulent conditions earlier this week.
They predict that gale-force winds up to 70mph will hit southern England and will disrupt transport across the region.
Heavy rain is expected in the morning, with further wind and rain arriving on Tuesday.
Here's the early forecast with Simon Parkin.
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1036mm of rain fell in the South of England in 2012. That is 130% of the average rainfall for the years between 1981 and 2010, meaning rainfall was 30% higher than the average for 1981 - 2010.
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