Heavy rain and some snow on the hills are forecast for Canterbury and Otago on Monday.
MetService initially said eastern Otago and Canterbury could expect 80mm - to 120mm rain over 24 hours
Light snow is falling on Lindis Pass, but police say the road is still passable.
Snow fell on Sunday on the Milford Pass road, but has since stopped.
Canterbury Regional Council said the catchments were reasonably dry and the river systems should cope with the latest rain, so no major flooding was likely.
Mid-Canterbury Federated Farmers president Chris Allen said being fed up with rain is an understatement.
He said 160mm of rain had fallen in April, compared to the normal 60mm. Springs and aquifers were full and the ground couldn't absorb much more.
Mr Allen said farmers in the region had already moved stock away from waterways a long time ago.