Weather live: Evacuation centre opened as 'heavy deluge' hits Dunedin overnight

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An evacuation centre opened in Mosgiel overnight, as torrential rain around Dunedin caused significant surface flooding.

Water had rapidly in High Street, Mosgiel, since 10.30pm on Sunday after a heavy deluge caused flooding the wastewater system under strain.

Surface flooding was reported across coastal Otago and Dunedin's civil defence bunker was activated on Sunday, with a red rain warning in place for coastal Dunedin and Clutha.

An orange heavy rain warning was also in place for coastal parts of north Otago with a high chance of upgrading to a red warning.

Warnings and watches have also been issued for other parts of the South Island.