Forecasters say two tropical lows, one off PNG and another off the Top End, could form into cyclones as they track toward north Queensland.

Two tropical lows tracking toward north Queensland could form into cyclones and cross the mainland, forecasters say.

The Bureau of Meteorology says there’s a high chance a low pressure system between PNG and the Solomon Islands, about 1000km northeast of Cairns, will form into a cyclone in the Coral Sea on Saturday.

Forecaster David Grant he says it’s difficult to predict whether the storm will cross the Queensland coast and where it might cross as it’s moving at such a slow rate.

“At the moment we couldn’t rule it out as it’s still a fair way offshore but it is moving towards the Queensland coast,” he told AAP on Thursday.

“But if that is the case it’s still a few days away from occurring.”

On Thursday afternoon the system was moving about 20km/h in a southwest direction.

Mr Grant says residents between St Lawrence and Cairns should expect heavy rain and high hinds over the weekend.

If it forms into a cyclone it will likely be called Gillian.

Mr Grant says there’s a moderate chance another weak tropical low off the Top End could form into a cyclone as it nears western Cape York on Sunday.

The system will bring heavy rain and strong winds to areas north of Weipa and the Torres Strait Islands over the weekend and early next week, he says.

There have been four cyclones in the region so far this wet season.

Cyclone Dylan made landfall between Airlie Beach and Bowen on January 31 as a category two cyclone, causing flooding and other minor damage along the north and central Queensland coast.

The following day Cyclone Edna formed but petered out in the Coral Sea.

Cyclone Fletcher made landfall as a category one storm between Karumba and the Gilbert River Mouth in the Gulf of Carpentaria on February 3 but it was a fizzer.