The Bureau of Meteorology (BOM) has released their three-month spring outlook with the La Nina weather pattern looking set to return.

The Illawarra is in line with much of the NSW coast to experience higher than average rainfalls and warm daytime temperatures.

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It comes as the region experienced above average rainfall in July and August, with the state's total making it the wettest winter since 2016.

For September, forecasters predict a 70-75 per cent chance of higher than average minimum and maximum temperatures for Albion Park, along with a 60 per cent chance of above average rainfall.

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For October, forecasters predict a 75-80 per cent it'll be wetter than average for Albion Park, but average daytime temperatures around 22.3 degrees.

BOM Manager of Climate Operations Andrew Watkins said it was being largely driven by changes in sea surface temperatures in the tropical Pacific and Indian oceans.

"Most long-range forecasts analysed by the Bureau, including from our own climate model, are indicating a La Nina could develop in the spring, which typically results in above-average winter-spring rainfall for Australia," Dr Watkins said.

"A La Nina also typically brings cooler and cloudier days, more tropical cyclones, and an earlier onset of the first rains of the northern wet season."

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Dr Watkins said spring was typically a time of year when outlook models had a higher reliability.

"At this time of year, we start to see some of our main climate drivers locking in, which gives more certainty about what our weather patterns will be like in the coming months.

Dr Watkins said overall, winter was drier than average for every state except New South Wales.