RESIDENTS in Queensland's Darling Downs are bracing for more floods, as emergency crews battle to contain grassfires across the state.

Heavy rainfall over the township of Chinchilla caused fast stream rises and minor flooding at nearby Charleys Creek early this morning.

But by the afternoon another Darling Downs settlement 100km to the south, Moonie, was preparing for floods.

The weather bureau has issued a warning for residents to expect the Weir River to rise, following a night of heavy rain.

Moderate flooding is likely tonight and into tomorrow, the Queensland Department of Community Safety says.

Meanwhile, about 120km to the northeast, a large, low intensity grass fire was burning near the town of Nanango today.

Six fire crews spent 20 hours battling the blaze at Stretton Drive in Teelah following an outbreak shortly after 7pm (AEST) yesterday.

No properties were threatened, the Queensland Fire and Rescue Service said.

In the state's north, at Charters Towers, a large grass fire started shortly before 11am but no properties were threatened.

Back burning has occurred between Louisa and Neylons roads.

In central Queensland, heavy rainfall over the Fitzroy River is causing fast stream rises and minor flooding at Windermere.

In the state's west, the Barcoo River is also rising.

The weather bureau expects minor flooding to hit Glenlock today, extending downstream to Retreat tomorrow or Tuesday.