Dunedin's hill suburbs have now been included in MetService's forecast for snow tomorrow morning.

Until yesterday, Dunedin was not expected to get snow like the rest of Otago and Southland.

However, meteorologist Ashlee Parkes said the updated forecast now showed snow showers would fall to 300m around Dunedin.

"We are expecting snow down to significantly low levels early on Tuesday morning — about 300m in Dunedin and about 200m in parts of Southland and Clutha.

"It is a showery flow, so there will be snow showers for a brief time in the early hours of the morning.

"It will settle, but not for long. We're not expecting large accumulations."

She said the southern regions should also expect bitterly cold strong-to-severe southwest gales tonight, going into tomorrow morning — particularly in coastal areas such as Dunedin.

"It's going to be quite cold first thing, but it should warm up later in the day as the winds ease."

Fellow meteorologist Kyle Lee said snow was expected to fall in inland parts of Otago as well, but not as low as Southland.

He said if snow did fall down to 300m inland, it would affect a lot of roads around the region, especially the higher routes.

"I expect it to cause some form of delays and affect a few higher roads, specifically in the Central Otago region.

"But at this stage it's hard to pinpoint which regions or exactly which roads we think will be affected."

He advised farmers to keep an eye on the forecast to see how it developed, because they might need to move stock to more sheltered areas.

"If they can, they should be prepared to act accordingly to whatever advice is given."

On Thursday, a ridge of high pressure was expected to move on to the country from the Tasman Sea.