For Moree it could be the best rain since March, while Tamworth's may be the most since October last year, Gabrielle Woodhouse, a duty forecaster at the Bureau of Meteorology, said.

"It's definitely welcome, but it's not going to be drought-breaking," Ms Woodhouse said.

Also, at least on current forecasts, there is little follow-up rain expected in the near term, she said.

The rainfall is thanks to a low-pressure system moving across South Australia that will interact with moist tropical air flows coming in off the Tasman Sea.

Storm risk

Thunderstorm activity might also be a feature of the weekend, with the possibility of intense storm activity over northern inland areas - unusual for this time of year.

"These thunderstorms could be severe with heavy rainfall, conducive to flash flooding, damaging winds, possibly downing trees and powerlines, and even some hail," Joel Pippard, a meteorologist with Weatherzone, said.

Sydney, too, has a chance of a thunderstorm early on Saturday, Ms Woodhouse said.

Daytime temperatures have been running about 2 degrees above the long-run average of 17.9 degrees, and will hover around that level for the rest of the week ahead.

One area of the state that has continued to collect relatively good precipitation of late has been the alpine regions, which are enjoying their best snow falls since 2004 up to this point of the season.

The latest average snow depth of 224.6 centimetres was recorded at Spencers Creek in the Snowy Mountains as of Thursday, according to Weatherzone.

"They've had an excellent season," Ms Woodhouse said, adding that more falls are likely in coming days.

A cold front crossing the Alps on Sunday may bring a further 15-25 centimetres of snow to the higher resorts during the week before another strong system passes from Friday, possibly dumping a further 20-30 centimetres, Weatherzone said.