Cape Town is on high alert after weather warnings were issued for the weekend, the city's disaster risk management centre said on Friday.

Inset: The Western Cape will see more heavy rain over the long weekend, according to weather forecasters (Photo: Michael Walker)

Weather SA said a cold front from the west of the city had strengthened and grown into a larger, lower frontal system.

Spokesman Wilfred Solomons-Johannes said the forecast indicated heavy rainfall on Saturday, peaking on Sunday.

He said persistent high rainfall was expected next week across the Cape Peninsula, associated with north-westerly winds reaching 60km/h.

Localised flooding was expected.

Residents were urged to dial 107 from a landline or 021-480-7700 from a cellphone in cases of emergency. - Sapa