Acre records 877 fires in September 2026, an increase of 80% compared to August

Acre recorded 877 fires in September 2026, according to data from the National Institute for Space Research (Inpe). The number represents an increase of 80% compared to August, when the state recorded 487 outbreaks.

Compared to September last year, when 840 outbreaks were registered, the number also increased. There are 37 more registrations, equivalent to an increase of 4.4% in the same period in one year.

The growth comes after a sequence of months with lower numbers at the beginning of the year. Between January and August, Acre recorded 584 fires. In September alone, the total recorded exceeded the sum of the first eight months of 2026 by 293 outbreaks.

In practice, the scenario follows the period of highest incidence of fires in the Amazon region. Historically, the months of August, September and October concentrate more records, during the Amazonian summer, when there is a reduction in rainfall and an increase in cleaning practices in areas using fire.

Furthermore, in 2025, Acre had an almost 100% reduction in fires in the first four months. That year, the state closed with 2,184 outbreaks, the lowest number in more than two decades and a 75% drop compared to 2024, when more than 8,000 outbreaks were recorded.

Despite the low final result, the beginning of that year attracted attention. In January alone, 43 outbreaks were registered, the highest number ever observed for the month since the beginning of the National Institute for Space Research's historical series, in 1998.

According to the data, in the ranking by municipalities, Feijó led the number of fire outbreaks in Acre in September, with 165 records, followed by Tarauacá, with 153.

Together, the two municipalities concentrated 318 outbreaks, equivalent to around 36% of the total recorded in the state during the month.

Rio Branco appears in third place, with 84 outbreaks, followed by Sena Madureira, with 72, and Manoel Urbano, with 53. Cruzeiro do Sul recorded 47 outbreaks, while Brasiléia had 39.

Inpe data shows that Acre started the year with few fires. There were two registrations in January and another two in February. In March, there were no outbreaks recorded, while April also ended with two records.

From May onwards, the numbers began to rise, with 15 outbreaks that month and 20 in June. In July, there were 56 registrations. In August, the state recorded 487 outbreaks, an increase of approximately 770% compared to the previous month.

The volume of rainfall helps explain the difference between the beginning and the rest of the year. In March, for example, Rio Branco recorded 366.8 millimeters of accumulated rain, around 33% above the historical average for the month. The scenario contributed to keeping fire rates low during that period.

The increase in fires also occurs in a context of pressure on the forest in Acre. In a survey released in August, the Institute of Man and the Environment of the Amazon (Imazon) identified Feijó, Tarauacá and Sena Madureira among the municipalities that deforested the most.

Feijó was in second place in the ranking, Tarauacá appeared in third place and Sena Madureira occupied eighth place. That month, Acre accounted for 22% of the deforestation detected in the Legal Amazon, with 97 km² of deforested area.

Also according to Inpe data, eight indigenous lands recorded fires in September 2026, with a total of 18 occurrences.

The Mamoadate Indigenous Land concentrated the largest number, with seven outbreaks, equivalent to 38.9% of the total.

Check out the list:

TI Mamoadate — 7 focuses TI Kaxinawá at Praia do Carapanã — 3 outbreaks TI Alto Rio Purus — 2 outbreaks TI Kaxinawá Nova Olinda — 2 outbreaks IT Campinas/Katukina — 1 focus IT Jaminawa/Envira — 1 focus Kaxinawá TI on the Humaitá River — 1 focus TI Poyanawa — 1 focus