Grain growers in Australia's south as well as Victoria have been advised to implement necessary measures as prevailing dry weather conditions are expected to continue for at least the next three months, according to the Bureau of Meteorology (BoM).

The Northern Territory, Queensland and northern NSW, meantime, ought to brace for a wetter three months ahead.

The culprit is the warming Indian Ocean, Andrew Watkins, BoM's Manager of climate prediction services, said.

"The Indian Ocean is quite warm and what we believe is happening there is it's enhancing the large high pressure systems in our part of the world," he said.

"These big highs suppress rainfall and they also unfortunately make the fronts slip down to the south."

"Our predictions are for dry conditions over the next three months in those southern areas."

Those portions of Australia have a 60 per cent to 70 per cent chance of receiving below-normal rainfall in that period, the bureau said.

The prevailing hot weather condition in South Australia is actually so hot that homes in Adelaide have reported experiencing cracks in their homes, such as splitting walls.

Cracking or splitting home walls in Adelaide is actually not a new phenomenon, since most of the homes in region were built on reactive clay soils.

Archicentre, a building advisory group, said calls from Adelaide residents seeking help from the dilemma have reached to almost 50 per cent of homes. Repairing these homes cost homeowners between $350 and $65,000.

And with the changing climate expected to get worse over the years, a parallel result can be expected on the cracking problems.

Most susceptible to cracking problems are structures built on dark brown or black clay, according to Edward Lukac, Archicentre state manager.

"If it's got clay in the mixture, it's susceptible to shrinking and cracking - particularly the older walls in homes," he said.

The last time Adelaide experienced severe cracking conditions was in between 2006 and 2010, the area's labeled "great drought."

"The homes most at risk are those on the old, bluestone foundations ... the homes in the inner-southern suburbs near the CBD are particularly bad areas for cracking," John Goldfinch, FMG Engineering director, told The Australian.

"This time of year is what we call cracked-house season."

"We are at the end of a long, hot, dry period," he said.

"The drying causes unsettlement of footings and of house walls and that brings in the cracking."

The Northern Territory, Queensland and northern NSW, according to the bureau's outlook for May to July, will likely receive between 60 and 80 per cent above median rainfall, which is basically good news for Australia's biggest wheat-producing state. Eastern Australia contributed 52 per cent of Australia's wheat harvest in 2012.

Last year's second- biggest wheat exporter, Australia's wheat output is expected to increase 13 per cent to 24.9 million metric tonnes this year, according to projections from the Australian Bureau of Agricultural and Resource Economics and Sciences. Farmers had begun planting.