"There could be some showers on the Canterbury Foothills."
Most of the South looked relatively fine on Saturday, he said, with the exception of the West Coast down to Fiordland which could have showers as the wind front heads there.
"Sunday makes weather in the South a bit cloudy with a chance of the odd shower."
Aucklanders can expect to have rainfall overnight and then some tomorrow morning, McInnes said.
"Motorists heading back to bigger cities have nothing to worry about, there is nothing significant ahead."
The weather forecast for Northland, Auckland and Coromandel is looking mostly cloudy with isolated showers, but widespread for a time this afternoon and evening and a chance of being heavy with thunderstorms in Northland.
For Waikato to Manawatu, including Bay of Plenty, the central high country, also Gisborne and Hawke's Bay, there is occasional rain or showers, possibly heavy with thunderstorms in the west from afternoon.
Horowhenua to Wellington, including Wairarapa and the Marlborough Sounds can expect rain, clearing this afternoon or evening but remaining mostly cloudy.
The remainder of Marlborough, Nelson, Canterbury and North Otago is mostly cloudy, with isolated light showers, clearing Nelson this afternoon.
Remainder of Otago and Southland have areas of cloud, with isolated showers clearing this afternoon.
Buller, Westland and Fiordland have areas of morning cloud, otherwise fine.
Chatham Islands is cloudy with a few light showers and weather is expected to get a little warmer for them.