You are not permitted to download, save or email this image. Visit image gallery to purchase the image.
The weather is expected to turn on Monday afternoon, with showers and possibly hail after a southerly change.
But Tuesday is where a deepening low-pressure system crossing the South Island could bring with it snow to inland parts of Canterbury, said MetService Meteorologist Kyle Lee.
"The whole South Island can expect to see wet and windy weather tomorrow, with snow lowering to as low as 300 metres in inland parts of Canterbury, with the heaviest snow above 500 metres. Although it is not common to get snow this low at this time of year, we've seen it before during those cooler, more unsettled spring seasons," she said.
The MetService has issued a "heavy snow watch" for Canterbury and the Kaikoura Ranges on Tuesday evening.
Looking ahead to Labour Day weekend, a fine weather is expected on Saturday for Christchurch, Ashburton and Kaikoura, while on Sunday a high of 21 deg C is expected.
On Labour Day, Christchurch will have a high of 18 deg C with one or two showers. But it is bad news for Ashburton and Kaikoura where rain is expected all day.