And the fact it came after the driest four month spell on record made May even more remarkable.

Throughout the month, Ballarat officially received 138.4mm of rainfall but despite having our coldest day since July last year, the average temperature ended up .1 of a degree higher than usual.

The rainfall however fell short of the May record which was 172.7mm which occurred in 1960. It is the also the wettest month since September 2016 when 178.2mm drenched the region, causing flooding.

We also saw Ballarat's coldest May day in 19 years, with the mercury struggling to just 5.7 degrees on May 29, the coldest day since since we made it to just 4.2 degrees on July 11 last year.

But despite what we have seen in the past 31 days, the Bureau of Meteorology doesn't hold out much hope of the wet weather continuing through winter.

Bureau long-range forecasting manager Andrew Watkins said models are predicting below average June rainfall in NSW, Victoria, eastern South Australia and southern parts of Queensland and the Northern Territory.

There's also double the risk of an El Nino forming in 2019 which typically means less rain for Australia's east in winter and spring.

"This certainly doesn't mean we will have no rainfall over winter - it is the southern wet season after all - but it does support the model outlook for a drier-than-average winter, with the possibility of more evaporation than normal," Dr Watkins said.

However, drier-than-average conditions also usually means an increase in cloud-free nights which increase the risk of frosts.

The bureau is also expecting warmer than average days for most of Australia.

"Our climate outlook shows most states and territories have large areas where chances are greater than 80 per cent for warmer than average days," Dr Watkins said.

The bureau will release its autumn summary on June 3 but preliminary figures show Australia has sweltered through one of its five hottest autumns on record.

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