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More heavy rain overnight in the south-east may delay a clean-up operation following a day of flash floods.
However forecasters said there would not be a repeat of the deluges in East Anglia, the south-east and London today.
The Environment Agency said that "recovery operations may be affected" but that flooding is not expected during the next three days.
Freak weather has hit the south coast following the recent heatwave. Lightning and heavy rain caused flashfloods in the region.
Lightning and hail storms hit Sussex at the start of the morning rush-hour, with flash flooding causing disruption to travel.
A lively start to the week with intense thundery rain through the south-east already - and further downpours in places this afternoon.
A few scattered, light showers will drift through Northern Ireland, the West Country and Wales.
Elsewhere a fine, bright day with sunshine. Looking good in Glasgow for the Commonwealth Games.
Highs of 22C in the north and 25C in the south, but muggy with the thundery air.
Two weeks worth of rain fell in just an hour this morning, battering England's south coast and causing flash flooding and disruption on the roads and rail. The Met Office said a "deeply unstable airmass" caused the storms.
ITV News reporter Richard Pallot reports:
Latest ITV News reports
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