Drivers are also warned snow may affect the Napier to Taupo State Highway 5 and State Highway 1's Desert Rd.
Frosty weather moves in towards the end of the week as high pressure builds and locks in the colder air.
However, warmer northerlies from the sub-tropics look set to return to New Zealand next week.
The pattern of cold blasts followed by warmer sub-tropical northerlies indicated New Zealand was unlikely to be colder than average this June if the northerly flows continue in the mix, WeatherWatch reported.
Canterbury will be one of the coldest regions in New Zealand tomorrow.