RAIN will affect parts of eastern NSW each day during the next week, with some wet weather also likely to spread west of the ranges.
A persistent stream of moisture-laden easterly winds feeding into a slow-moving upper-level trough will cause the sustained period of wet weather.
Rain will ramp up over north-eastern NSW on Friday and continue to affect parts of the state's north east and east until at least the middle of next week.
With the rain-bearing winds coming from the east, most of the wet weather will occur on and east of the ranges.
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However, some showers and storms should also spread to the northern and central inland on some days during the next week.
The exact location and amount of rainfall will depend on the movement and strength of an upper-level low pressure system, which becomes difficult to predict beyond the weekend.
But even with this uncertainty, some coastal areas of northern NSW are likely to pick up more than 200mm of rain by next Wednesday.
The sustained easterly winds over NSW will also help keep a lid on temperatures and prevent a repeat of the record-breaking heat that swept over the state in the final days of spring.
The mercury may only reach the mid-to-high teens around Orange and Bathurst this weekend, around five to eight degrees below average.
This continues a run of unusually cool temperatures in NSW this week.
On Tuesday, Deniliquin registered a minimum temperature of just 4.6 degrees, which was the lowest December temperature measured in the town since 1903.
The coming week's wet and relatively cool weather will be a stark contrast to last month, which was the state's driest November in 18 years and its fifth warmest November in record.
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