Residents have been told to cherish the overnight low of about 15 degrees, with maximum temperatures falling short of that figure in the days ahead.

Technical officer of Wagga's Bureau of Meteorology station, Nigel Smedley, said a soaking was on its way Wednesday.

"We're looking at a 95 per cent chance of between 20 and 50mm of rain, it will be a cloudy day," he said.

Heavy falls with the chance of thunderstorms are forecast as the cold front begins to move from south of the Bite through to the central west, according to Mr Smedley.

"The cold front will reach us later in the day and really hit Thursday, bringing widespread rain followed by a significant wintery blast," he said.

Thursday's forecast predicts a low of 8 degrees, reaching a top of 12 and bringing more rain as well as snow in alpine regions.

"There is a 100 per cent chance of 15-25mm of rain on Thursday, and an 80 per cent chance of only 2-5mm on Friday but temperatures will still be cold with a minimum of 5 and maximum of 9 degrees," Mr Smedley said.

While a flood warning has been issued for the Tumut region, Mr Smedley said Wagga would most likely be spared from too much damage.

"Catchments are relatively wet in the western parts and the rain coming may lead to minor flooding along tributaries of the Murrumbidgee," he said.

Ian Leckie of the Wagga's SES unit said they were gearing up for the wild weather, but weren't overly concerned about flooding.

"We have been preparing and talking to farmers and those in lower lands to make sure they are ready in case of any flooding," he said.

"Along the Murrumbidgee, though, it's unlikely to flood in town but we ask people to ensure their homes are water proofed and that they are ready for run off down hills and such.

"We still have time, so tidy up your properties, clean your gutters, and make your property as secure as possible."