According to government data, the first 12 days of August have seen about the same number of fires as this time last year, when a sharp increase in blazes across the Amazon attracted international condemnation.
On Tuesday (August 11), Brazil's President Jair Bolsonaro denied there were any fires in the Amazon, calling it a "lie" and blaming the media for spreading it.
Experts say that fires are rarely a natural phenomenon in the rainforest, resulting instead from deliberate burning by farmers and land speculators to clear deforested land for pasture.
Wind and heat can quickly change the pattern of a blaze. Even rainfall from months ago can make a difference.
Deforestation rose 34.5% in the 12 months through July, compared to a year earlier.
Bolsonaro has dispatched the military to fight fires and deforestation since May, but environmental experts question whether these deployments are working.