Temperatures are about to rocket upwards, with some places tomorrow 15 degrees warmer than they were yesterday.

It’s all thanks to a north west flow out of Australia and the sub-tropics.

Daytime highs will be several degrees warmer than average across much of the South Island.

The warmer weather takes another day to reach the North Island, so while Saturday is a mild day Sunday looks even milder there.

Things will cool down a little in the south on Monday.

– WeatherWatch.co.nz