Widespread frost will develop across NSW during the next few nights, while heavy showers are set to develop for some areas east of the ranges this weekend.

Clear skies and light winds underneath a slow-moving high pressure ridge will provide ideal conditions for frost to form over inland districts of NSW during the next few nights.

Temperatures are forecast to dip to minus five degrees in parts of central NSW and close to minus 10 on higher parts of the southern ranges before the end of this week.

The slow-moving ridge will also direct south to southeasterly winds onto the NSW coast during the coming days, allowing showers to develop east of the ranges.

These showers will increase along the coast and adjacent ranges during the weekend and early next week, as winds turn more onshore. Some areas along the central and northern coastal fringes could see more than 50mm by next Wednesday, although rainfall totals will drop off as you head inland.

Image: Accumulated rainfall predicted by the ECMWF-HRES model between now and Wednesday, June 26th.

The ridge over NSW will also prevent any rain-bearing cold fronts or low pressure troughs from reaching the state's west this week. Unfortunately, this dry weather pattern looks to continue through the back end of June for the state's west.

Looking ahead, the Bureau of Meteorology predict that drier and warmer than usual weather will continue across much of western NSW during the rest of winter. This outlook is being driven by a developing positive Indian Ocean Dipole and a weakening El Nino-like pattern in the Pacific Ocean.

Drier weather during the winter months can enhance the development and severity of frost, particularly in areas affected by drought.