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.
The wet weather that left many people spending Bank Holiday Monday indoors is set to ease ahead of the weekend - and despite the prospect of more rain on the horizon, especially in, the South East, there is no suggestion that it will bring major flooding.
Rainfall will weaken over the next 36 hours, heralding a drier day for many on Friday before the sun brings warm temperatures over the weekend.
There will be a largely dry day on Friday for northern parts of the UK. Even though it is quite miserable it is quite warm outside and muggy, and today there will be highs of 16C-18C across south-east England away from the coasts. Tomorrow onwards we are looking at a general warming trend, with 19C across south-east England. But over the weekend we could see 21C-22C across the South East and a predominantly dry day on Saturday. I wouldn't rule out rain or showers, but they won't be particularly heavy.
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.
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.
In the South East of England there was 999.7mm, 127% of the average level of rainfall for the years between 1981 and 2010, meaning rainfall was 27% higher than the average for 1981 - 2010.
The year 2012 was the wettest year on record in England - it's official.Read the full story ›
Will it dry up in time for New Year's Eve celebrations in the South East? Luke Castiglione has the latest weather forecast.
Luke Castiglione has a look ahead to the weather on New Year's Eve and for the start of 2013.