According to the Bureau of Meteorology, the national outlook for total August to October rainfall shows moderate swings in the odds towards below-normal rainfall in central Western Australia and also in a band extending from northern Queensland through to central South Australia.

But the outlook shows higher than average rainfall is favoured in the southwest of WA.

The Bureau says this pattern of seasonal rainfall odds across Australia is a result of a continued strong warming trend in the Indian Ocean off the west coast of WA, and a warming trend in recent months over the equatorial Pacific Ocean.

Over the rest of the nation, late-winter to mid spring rainfall totals have a 40-60pc chance of exceeding the three-month median.

So the chances of being wetter than normal are about the same as the chances of being drier, the Bureau says.

The Bureau has also released its national outlook for maximum and minimum temperatures, which shows a moderate to strong shift in the odds towards warmer than normal conditions over most of the country, especially in the sub-tropics.

Averaged over August to October, the chances are mainly between 60pc and 75pc for above average maximum temperatures (see map).

In southern Queensland, parts of northern NSW and much of the southern half of WA, the chances increase to over 80pc.

Average seasonal minimum temperatures are also favoured to be warmer than normal across most of the country.

The chances of increased overnight warmth are between 60pc and 75pc over most of Australia, increasing to above 80pc over much of WA.

The probabilities are between 55pc and 60pc in Tasmania and between 45pc and 55pc over Cape York Peninsula.