The system, which is about 1,000 kilometres east of Brisbane and moving west, is then due to travel north-west into the Coral Sea.
Forecaster Jess Carey said there was a "slight possibility" it would intensify into a weak category one cyclone.
"It's moving into a body of water that is slightly warmer, so it's moving into more favourable territory," he said.
"The effects are going to be the same whether it's a category one cyclone or an ex-tropical cyclone: big seas, big waves and pretty significant high tides as well."