The Queensland bushfire crisis has eased slightly with conditions downgraded from catastrophic to severe.

However, authorities are warning the state is not in the clear yet as heatwave conditions will continue to grip the central and north coast until Tuesday at least.

Thousands of Queenslanders have been forced from their homes as firefighters battled up to 140 wildfires.

Premier Annastacia Palaszczuk said Queensland is still facing unprecedented conditions and "uncharted waters we have not seen the likes of before".