The countries made the 20-million-U.S.-dollar aid offer at the G7 summit hosted by French President Emmanuel Macron in the French seaside resort of Biarritz. Macron proposed that the member countries take part in fighting the fire.
"We appreciate (the offer), but maybe those resources are more relevant to reforest Europe," Brazil's G1 news website quoted Onyx Lorenzoni, chief of staff to Brazilian President Jair Bolsonaro, as saying.
"Macron cannot even avoid a foreseeable fire in a church that is a world heritage site," he added, referring to the fire in April that devastated the Notre-Dame cathedral. "What does he intend to teach our country?"
Although Brazil owns some 60 percent of the Amazon rainforest, the forest also covers eight other countries or territories, including the French overseas territory of Guiana on the northeast coast of South America.
A total of 71,497 forest fires were registered in Brazil in the first eight months of 2019, up from 39,194 a year ago, according to data from Brazil's National Institute for Space Research.