An official weather warning about heavy rain covers all Sussex from early on Friday (June 18) until Saturday morning.
It will then be followed by more rain on Saturday evening, stretching into Sunday, though on Friday morning this was not part of any weather warning.
Met Office forecasters said downpours are likely to move from the English Channel into Sussex, then go north after a time.
There's a small chance of thunder and lightning, too, although that has reduced since the warning was first issued at the start of this week.
Britain's official weather prediction agency said:
"A spell of quite prolonged and often heavy rain is expected to spread northwards into parts of England on Friday though there remains uncertainty in how far northwest this progresses.
"This area of rain then clears away northeast on Saturday morning.
"Parts of East Anglia, the East Midlands and southeast England may see 20-40 mm of rain with a few sites potentially seeing 50-70 mm.
"However, many parts will see much less rainfall.
"Some thunder and lightning is also possible, particularly in East Anglia, the East Midlands and southeast England but heavy rain is the main hazard."
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