The Bureau of Meteorology says much of NSW and the ACT will experience a significant drop in temperatures over the coming days.

The cold front will move over the area throughout Tuesday, into Wednesday and Thursday.

It is possible there will be snowfalls across several locations in NSW, beyond the Alpine regions, beginning in southern areas on Tuesday night and extending north.

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Any showers on Wednesday in the 800m and 900m buffer zone can also expect sleet during that period.

Wednesday and Thursday will be the coldest days across NSW, and the temperatures on Wednesday will be between 4 and 7 degrees below average.

On Thursday, the lowest temperatures in the state will be in the Northern Tablelands, where they will be 8 degrees below the June average.

And it is not only snow and rain heading our way - strong and gusty winds are likely to begin in some areas from Tuesday.

On Wednesday in Armidale, there is nearly 100 percent chance of rain then snow, most likely in the morning. With a chance of a thunderstorm in the late morning and afternoon with small hail in the afternoon and evening.

The temperature will range between 1 and 8 degrees before plummeting on Thursday to a maximum of 4 degrees from a freezing -2 degrees overnight.

In Walcha on Wednesday, snow is predicted with a temperature range of 1 to 6 degrees, followed by more snow on Thursday and a high of only 3 degrees.

However, on Thursday, Guyra will be potentially the coldest places in NSW, with an expected high of only 1 degree with snow showers and wind. Glen Innes can expect a top of 3 degrees from -3 degrees overnight; Inverell and Tenterfield will both be comparatively balmy with a predicted high of 5 degrees.

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Walcha, Hanging Rock, Ben Lomond, Guyra and Glen Innes are on the list of places that could become winter wonderlands on Thursday.

There is still a possibility of light snow even below 900 metres, but it will melt quickly while snowfall is expected to stay around all day in those areas with a higher altitude of 1000 metres or more.

The Bureau of Meteorology warns snow and ice may lead to dangerous driving conditions.

The conditions are the result of a strong cold front that will cross much of NSW on Tuesday with a very cold pool of air moving into the west, then northeast of the state.

An associated surface low is expected to develop on Tuesday somewhere over southern to eastern NSW or Victoria before intensifying on Wednesday and Thursday, with associated troughs and fronts spiralling around this.

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