Icy conditions are forecast over parts of the South Island, with Canterbury getting the brunt of it.
Much of the south enjoyed a fine weekend after last week's heavy snow.
Christchurch and Canterbury recorded some of the coldest temperatures on record last week, and frigid conditions are again likely.
"We're barely into winter and once again the bitter cold is set to return," said WeatherWatch weather analyst Richard Green. "It's the type of cold that is raw and can really get into your bones if you're not prepared, as the wind this week is likely to pick up.
"Normally the coldest weather comes after the shortest day but this year Mother Nature has obviously thought she'd take a different approach. It might be a mix of showers of rain, hail, sleet and snow in some cases but whatever falls it'll be the temperature that bites."
Daytime highs in June for Christchurch usually push up towards 11C or 12C but last Wednesday it was just 0.4C and the city was hit with heavy snow.
On Saturday night, some places dropped below 5C and Darfield, 30km west of Christchurch, plummeted to 11C.
MetService issued a weather watch for Banks Peninsula and eastern areas of Southland and Otago.
WeatherWatch.co.nz believes snow showers are likely down to 100m or 200m for much of Canterbury, Otago and Southland today.
Temperatures are likely to be in single figures for much of the week, with sub-zero overnight lows.