Statewide, the mean, maximum and minimum temperature for January were all the highest on record, which the bureau attributed to several heatwaves. 

Ulladulla broke records last month, reaching its highest mean daily minimum temperature in 27 years, rising from 19.3 degrees to 19.8 degrees. 

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Off the back of the record-breaking summer, the bureau said most of the country would experience hotter temperatures through autumn.

The average daytime temperatures for Nowra during autumn are 25.8 for March, 22.9 for April and 19.5 for May. 

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BoM senior hydrologist Robert Pipunic said there was an 80 per cent chance that most of the country would experience hotter temperatures through autumn.

"Night time temperature are likely to warmer than average for most of Australia," he said. 

In 2016, NSW experienced its warmest autumn ever recorded and in 2018, the second warmest autumn was recorded.

While rainfall isn't expected to exceed an averages, Mr Pipunic said the "autumn break" - the first significant rainfall ahead of winter - was forecast to hit later in the season this year. 

"There are no strong odds for either wetter or drier than average conditions for much of Southern Australia from March to May," he said.

"However recent years have seen a tendency for a later autumn break." 

So far this month, Ulladulla has reached tops of 34.6 while Nowra has reached top temperatures of 35.1 degrees.