A wetter-than-usual summer has been predicted along Australia's east coast - particularly coastal NSW.

Most of Victoria, large areas of Queensland, as well as northern and eastern Tasmania are also expected to experience higher-than-average rainfall this summer.

While the ACT will finally get a taste of spring this weekend with 25-degree tops forecast for both Saturday and Sunday, Canberra has been included in the wet summer warning.

Cooler days are also likely for the ACT and most of NSW, as well as parts of southern Queensland and into Victoria in the months ahead.

The bureau has warned any significant rainfall has the potential to lead to widespread flooding where rivers are already high, dams are full and catchments are wet. Coastal areas are at a heightened risk around January 23 and February 20 due to an unusually high tide forecast.

The above-average rainfall also increases the risk of landslides and tree falls in areas of steep terrain due to wet soil conditions, the bureau warned.

It follows a year of record-breaking rainfall for parts of Australia. Residents in parts of central west NSW remain unable to return to their homes as flood waters inundate towns around the Lachlan River, including Eugowra and Condobolin.

Popular walking and cycling trails in some parts of the NSW South Coast have been closed due to the above-average rain, including parts of the Eurobodalla, Budawang, Murramarung and Meroo national parks.

Pebbly Beach to Snake Bay walking track is currently closed in Murramarung National Park, Termeil and Sunburnt Beach campgrounds are closed in Meroo.

Plovers Lane, Jemison's Point and Honeysuckle Road are closed in the Eurobodalla due to rain damage.

The Araluen Road remains closed to vehicles, pedestrians and cyclists following a landslide 43km west of Moruya.

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Bureau climatologist Andrew Watkins said climate patterns behind recent rainfall may start to ease towards the start of next year.

Sea surface temperatures were warmest on record in October, Dr Watkins said. Warm oceans can increase the amount of rain and moisture in weather systems.

The negative Indian Ocean dipole has been weakening in recent weeks and models indicate the La Nina in the Pacific Ocean may start to ease in early 2023, he said.

While much of Australia is now on track for its wettest spring on record, drier-than-average conditions are expected in large parts of Western Australia.

Summer days are also likely to be warmer than average across most of WA and the Northern Territory, north and central Queensland coastal areas and parts of the south, including Tasmania.

"Bushfires are always a risk in southern Australia in summer," the bureau said.

"Vegetation growth after above-average rainfall can lead to a risk of grass fires."

The Australasian Fire and Emergency Service Authorities Council will release its Summer Bushfire Outlook on November 29.

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