The Metservice is warning Coromandel locals of an unusually late cold spell that will blow in this week.

It follows a fine and sunny weekend for most but a number of volatile fronts will be moving over the country this week.

These fronts will herald an unusually late cold spell as we move through the week, says MetService Meteorologist Rob Kerr.

'The temperatures this week will be well down for the time of year, with gales, hail and thunderstorms thrown in to the mix.

'Several cold southwest changes march northwards over the next few days, reaching the North Island Tuesday and early Wednesday.

Rob says this highly unstable air will bring a risk of thunderstorms for many areas.

The weather is expected to settle down for Friday and remain mostly fine and dry for early Saturday.

But Rob warns another swift moving front is expected during Saturday and Sunday.