Rainfall is expected to varied, with some parts expected to receive up to 60 millimeters of rainfall, while others may receive as low as 5.
"For the entire Hunter district tomorrow and Saturday, they'll be some showers and thunderstorms in the afternoon."
"At this range it's not possible to know where we'll get it, but we're confident there will be some about."
The upcoming rainfall will push this January into the wettest one in memory.
"We've got an old record of 404mm, 1895 it dates back to" says Mark Wilgard, Observations Officer at Williamtown Weather Office.
"As of yesterday, 9am we had 402.8mm, but since then we've got the 1.2mm."
"So the record's been equaled."
This weekends rain is being blamed on a low pressure trough which is moving itself across the Hunter.
"We think with the trough nearby there will be some showers and thunderstorms this evening" said Mr Webb.
"That trough will probably move across the Hunter on Saturday, causing more showers and thunderstorms."
The poor weather is expected to move on by Sunday.
