In terms of the city's wettest month of 2021, overnight rain across Orange tipped the scales in November's favour with 15.4mm recorded to 9am on Sunday morning.

That, along with a couple of more millimetres post-9am, takes the city's rainfall total for the second last month of the year to 242.4mm, passing the 233mm recorded in March.

That November total is already the city's wettest on record and has rocketed the region's annual rainfall total for 2021 past the 1300mm mark.

The 1316.2mm in the bank for 2021 is just the seventh time in over 130 years of records being taken in Orange that the city has passed the 1300mm barrier - and mother nature isn't looking back, either.

There's a 95 per cent chance of rain on Wednesday, with between 15mm and 30mm expected to fall, while there's 95 per cent chance of another drenching on Thursday, too, with anywhere between 20mm and 35mm on the cards.

The forecast dries out a touch on Friday, with a 70 per cent chance of rain - there's upwards of 8mm on the radar - but the mercury isn't being kind either.

Friday's maximum temperature is predicted to reach just 15 degrees Celsius - well down on the 21.9 average for November - and that's the same for Saturday too, while the overnight low will be 5 degrees.

Should those predictions this week come to fruition, 2021's rainfall total could nudge the 1400mm mark before December, a month which is historically the city's wettest.

December averages around 86mm of rain.

Our wettest year on record was in 1950 when 1666mm was recorded. In 2010, 1580.4mm soaked Orange, while this year's total has already passed one of the wettest years we experienced in the last decade, with 1261.4mm in 2016.

The Bureau of Meteorology warned of a La Nina event last year, with the bureau's Manager of Climate Operations, Dr Andrew Watkins, predicting above-average winter-spring rainfall for Australia.

The last significant La Nina event was in 2010-11, which was the Australia's wettest two-year period on record beating the previous record from the La Nia years of 1973-74.

The record rain in Orange throughout November has been part of a wider soaking for the Central West, with widespread flooding for the region.

Forbes, particularly, has been hit the hard as water levels steadily rose in the Lachlan River.

Ahead of Monday, the Lachlan River is at major flood levels at Jemalong and still rising, the Bureau of Meteorology's Sunday morning flood warning reveals.

The main flood peak is expected to reach Jemalong on Monday, with a level of 8.1m predicted at Jemalong Weir Downstream. It was at 7.91m at 8.45am Sunday.

Moderate level flooding continues from Nanami upstream through to Forbes and the Iron Bridge, where the level has dropped from a peak near 10.4 to 10.28m as of 9am Sunday.

Water NSW had reduced the level of Wyangala Dam to 95.5 per cent by Saturday with airspace releases ahead of significant wet weather forecast for Sunday, but that system looks to have been pushed back to mid-week.

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