There will be blustery showers around the fringes of Scotland which will continue to be on and off throughout the course of tomorrow.
Rather than a winter phenomenon, hail is surprisingly common during the most intense summer thunderstorms.
Lightning and hail storms, described by locals as like walking through a 'zombie apocalypse,' causes travel chaos in Brighton.
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.
Temperatures get a boost again tomorrow.
Most of us will see some sunshine at some point tomorrow - highs of 25-27C possible in places it'll feel warm - but feeling cooler across north-west Scotland.
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:
Some showers, which may be heavy, will continue this morning over Wales and southwest England, but these areas will become largely fine this afternoon.
Some heavy, slow-moving and at times thundery showers across East Anglia and the south-east will bring some localized flooding.
Elsewhere it will be mostly dry with sunny spells, away from the far north of Scotland, where it will remain overcast and misty.
In the sunshine it will feel quite warm with a high of 25C (77F) across the south.