Snow has closed two southern roads and caution is being advised on several others.

State Highway 93 between Mataura in Southland and Clinton in South Otago was closed on Thursday night, as was SH94 between the lower Hollyford turnoff and Milford Sound.

Caution was advised on the Crown Range between Wanaka and Arrow Junction and SH1 between Milton and Waipahi, in South Otago.