Weather-weary Queenslanders have escaped the latest cyclone threat with a system off the coast likely to be downgraded this afternoon.

The weather bureau says Tropical Cyclone Tim intensified slightly yesterday afternoon and evening.

However, senior forecaster Brett Harrison says the system has weakened this morning.

"We do expect it to be downgraded to a tropical low this afternoon," Mr Harrison said.

"Until that time [it will] remain as a category one system with wind gusts up to 100 kilometres an hour."

He says the system is likely to move further north as it nears the coast, producing showers and rain north of Mackay.

Mr Harrison says the rain should not be particularly heavy.