The BOM's manager of long-range forecasting Andrew Watkins said the state was likely to experience both daytime and overnight temperatures above average.

"In terms of rainfall for Tasmania we aren't seeing a strong push towards wetter or drier than average conditions, but in terms of temperatures it is looking like it will be warmer than average for much of the state," he said.

"The mainland is looking wetter than average and that's mainly due to these North-West cloud bands we're expecting to form out of Eastern Indian Ocean to bring more moisture across the country.

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"Typically those North-West cloud bands don't extend all the way down to Tasmania, they can sometimes but typically they don't extend through to Tassie and bring the above average rainfall.

"However around Tasmania we are expecting ocean temperatures to stay warmer than average, that's whats probably driving those warmer than average days and nights that are likely for the winter."

BOM will release its autumn summaries on June 1 but the preliminary summary showed the state's rainfall had been above average in most parts. Particularly in the state's north and Western and Eastern coastal areas.

Dr Watkins said the state had experienced its wettest autumn since 2016.

"It's been wet particularly across the Northern Tasmania," he said.

"In terms of temperatures, well it's been relatively cool, the coolest autumn since 2015."

Daytime autumn temperatures were close to average for most of the state but cooler than average in Eastern parts.

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