Weather forecasters are closely monitoring a series of transient small low pressure systems that have the potential to produce heavy rainfall over the Port Macquarie-Hastings.
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At the upper limit, the area could experience falls of up to 80 millimetres, although weatherzone's meteorologist Graeme Brittain says model uncertainty also indicated a low of just 10mm.
"It just depends on where this trough and low is situated," he said.
"We will see the heaviest falls on the southern flanks while north of this system will be quite dry.
"It could be quite significant this rainfall but you could also miss out."
Mr Brittain said winds will be mainly from the south and up to 40 kilometres per hour, but were again dependent on the positioning of the system.
The Bureau of Meteorology says the series of low pressure systems are expected to develop within a trough over the Tasman Sea later in the week.
These will result in rain and gusty winds developing along stretches of the NSW coast and eastern ranges between Thursday and Saturday.
Steady, moderate rain is expected over a broad area along the coast/eastern ranges during this period, with areas between Nowra and Port Macquarie most likely to see rainfall, the bureau says.
Whilst rainfall is welcome news, pockets of heavier falls are also possible in these areas, which could make road conditions and waterways dangerous.
It is too early to call where the heavier rainfall will be, as this will depend on where exactly the low pressure systems form and how close to the coast they are.
- Bureau of Meteorology
"It is too early to call where the heavier rainfall will be, as this will depend on where exactly the low pressure systems form and how close to the coast they are," the bureau said in a statement.
"The heaviest rain will be in focused bands on the southern flank of the lows.
"Catchments are relatively dry so riverine flooding is not considered a risk at this stage.
"For low coastal catchments, high tides will be near the highest levels for the month but water levels are expected to remain below the minor flood level."
Regardless of the intensity of the rain, some areas will see more rainfall between Thursday and Saturday than they have seen in the last two months
Port Macquarie's average rainfall for July is 62mm with just 38.6mm record while August's average rainfall is 64mm - just 7.4mm has so far been recorded.
Thursday's temperature range will be seven degrees up to 21 degrees while Friday's range will be from six degrees to 19.
Saturday will start out with a low of seven degrees before climbing to 20 degrees.
Monday will be drier with the temperature topping out at around 25 degrees.
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