The Bureau of Meteorology is predicting a run of three days – Saturday, Sunday and Monday – with temperatures breaking the 39 degree barrier.

If the forecasters are correct, it will be hottest April day in the 30 years records have been kept at Tindal, where our official weather is taken from.

The current record is 38.4 degrees, from April 1 in 1984 although unofficial records show the maximum temperature on April 3 was close to the mark.

It has been a hot and dry end fo the wet season in Katherine.

The bureau says we are transitioning from the wet to the dry season.

It has not rained in Katherine for about a month.

Katherine is 150mm behind its average rainfall for this time of year.

Total rainfall is also about one half of where it was at the same time as last year.

An unseasonably hot air mass has been breaking April records across parts of southern and eastern Australia this week.

A pool of heat that brought Australia's latest 45 degree days on record in the Pilbara two weeks ago has spread south and is now causing unprecedented April warmth in Adelaide, Sydney and many places in between.

Sydney registered its highest April temperature in 160 years of records on Monday afternoon, reaching 35.4 degrees at Observatory Hill. This beat the city's previous April record from 2016 by more than a degree.

Today is Adelaide's third consecutive day at or above 34 degrees, which is the city's longest three-day spell this hot during April in 132 years of records.

Mildura's 38.1 degrees just after midday today is a new April record for Victoria, beating the state's previous record of 37.8 degrees from 1986, also from Mildura.

Canberra's five days above 28 degree between last Thursday and Monday this week was the city's first such spell during April on record.

The long-term average temperature for April in Katherine is 34 degrees.