Get ready to rug up Melbourne. The lowest temperature so far this year has been forecast on Friday morning.

A high pressure system passing over Victoria towards the end of this week will cause clear skies and light winds across the state. These calm conditions will combine with cold air lingering behind a weak front, allowing overnight temperatures to plummet.

Image: Forecast surface temperature and mean sea level pressure contour lines on Friday morning, according to the ECMWF-HRES model.

Melbourne's average minimum temperature during May is about nine degrees, however the city is forecast to reach seven degrees on Thursday morning and just five degrees on Friday morning. There's even a chance the mercury could dip closer to four degrees on Friday.

Based on these forecasts, Friday will be Melbourne's coldest morning since October last year and the city's coldest autumn morning in four years.

Some other places in Victoria are forecast to have their coldest morning in 7-8 months on Friday as well, including Shepparton (1C) and Bairnsdale (2C).

This week's cold mornings won't challenge Melbourne's May record of -1.1 degrees from 1916.