Wanganui Residents may need to complete their exterior work before Thursday due to the upcoming wet weather.

This week, from Thursday to Saturday, warm tropical showers are expected to hit the region, MetService says.

Saturday is expected to be the worst of the three days, with a combination of showers, southerly winds, clouds and average temperatures between 12 and 20C.

Despite occasional rain on Thursday, people will be able to enjoy a warm breeze from the north and temperatures ranging from 15 to 25°C.

MetService meteorologist Lewis Ferris said a low pressure system was looking to form in the Tasman Sea which would bring in warmer, humid air from the tropics.