A cold front rolling over the South Island over Sunday is forecast to bring wintry conditions, with NIWA warning of "gusty winds & wintry precipitation".
"Snow is looking to stay above 1200m, treating our fave ski spots to a fresh dusting. But watch out for tricky conditions on the slopes with low visibility and brisk winds," it said on Twitter.
After this, MetService says a strong, moist northwest flow will affect the South Island during Monday and Tuesday.
"There is low confidence that rainfall accumulations will meet warning criteria in Fiordland and southern Westland. Northwest gales should affect the Southern Alps, but at this stage they do not look likely to become severe," its severe weather outlook reads.
"From late Tuesday to early Wednesday, a frontal wave is expected to move rapidly southeastwards over the upper North Island, and there is low confidence of severe northwest gales."
Then, MetService forecasts cold and showery southwesterlies should spread up New Zealand over Wednesday, then ease on Thursday as a ridge of high pressure brings more settled weather.