How long did the Boca do Acre fire last?

According to the heat detections seen by satellite inside the perimeter, it burned from 10 August 2024 to 3 September 2024 (25 days). The perimeter dates it from 17 August 2024 to 29 August 2024.

How much area did it burn?

The perimeter GWIS (Copernicus) rebuilt from heat detections is 3,899 hectares (39.0 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire only entered Boca do Acre (3,928 ha, 0.2 %).

What was the weather like?

During the fire the temperature reached 37.7 °C, humidity dropped to 27 % and gusts hit 43 km/h. The fire danger index (FWI) reached 35, class High.

Where does this data come from?

From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Brazil (geoBoundaries). It is not an official report.

BR · Brazil · 2024-08-10 → 2024-09-03

Boca do Acre fire, 10 August 2024 Boca do Acre

Out · last detection 3 Sept 2024, 05:55 UTC

The fire started on 10 August 2024 in Boca do Acre, Brazil, and satellites saw it burning for 25 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,899 hectares from heat detections, spread across a single municipality.

It is the 269th largest in Amazonas since 2016 (of 450 with a page). Number 942 in Brazil in 2024, of 1301.

Compare with…

Suggestions: Boca do Acre · 2022 Boca do Acre · 2026 Boca do Acre · 2024

Burnt area: 3,899ha; GWIS perimeter (Copernicus)
Duration: 25days; 10 Aug 2024 – 3 Sept 2024
Municipalities hit: 1; municipalities
Started on: 10 Aug; 2024
Heat detections: 264; in a single hotspot: 89 MW
Danger at start: 24; High · FWI index
Average daily power: 101MW; detected power per day, on average

HOTSPOTS BY DAY 10 Aug3 Sept

Play back 3 Sept 2024

How it evolved, day by day

10 Aug 14 Aug 19 Aug 25 Aug 26 Aug 28 Aug 31 Aug

Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.

The weather it burned in

38°high

43km/h · peak gust

27%lowest humidity

It had gone 3 days without rain (1 mm or more) when it started. Rain came after the fire: 7.0 mm on 5 Sept.

This area had burned before

73% of the perimeter overlaps earlier fires recorded since 2016: 140 ha in 2020, 108 ha in 2021, 4,104 ha in 2022, 1,676 ha in 2023. Part of it burned more than once, so the yearly figures add up to more than the 2,865 ha that had burned before.

1,921 ha Boca do Acre fire, August 2022 3,934 ha in total; the hectares shown are those it shares with this fire

How big is it?

It burned the equivalent of 2.5% of the area of London (39 km² against 1,583 km²).

London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).

This compares size, not location: both shapes are at the same scale, north up, centred on each other.

What happened to each town

Boca do Acre 35,447 inhabitants where it started

3,928 ha reached on 10 Aug

0.2 %

Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance runs from the point marking the centre of each area to the nearest fire: staying a kilometre away does not mean it reached the houses.

People and buildings inside the perimeter

GHSL 2025

Built-up area< 0.1 ha

Residents< 20

Inside the perimeter there was no noticeable built-up land and almost nobody lived there (GHSL 2025, satellite-based estimate).

This is an estimate on 100 m cells, made from satellite imagery and census data: it does not mean that homes burned or that anyone was harmed. The perimeter also contains land that never burned. The GHSL 2025 epoch is a projection made from 2020 and earlier data.

Source: Global Human Settlement Layer (GHS-BUILT-S and GHS-POP R2023A), European Commission Joint Research Centre (JRC), © European Union, CC BY 4.0. Sum inside the perimeter computed by WorldFires. human-settlement.emergency.copernicus.eu

The weather day by day

ECMWF ERA5 reanalysis at the fire location, the standard reference for past weather, and the Canadian Fire Weather Index (the same system Copernicus uses), computed by WorldFires from that data. Days after the fire run until the first rain.

Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)

Day	High	Min. humidity	Peak gust	Rain	Danger (FWI)
10 Aug	27.2 °C	42 %	43 km/h	0.0 mm	High 24
11 Aug	30.4 °C	38 %	23 km/h	0.0 mm	High 23
12 Aug	32.5 °C	35 %	34 km/h	0.0 mm	High 28
13 Aug	32.5 °C	27 %	31 km/h	0.0 mm	High 34
14 Aug	33.9 °C	31 %	19 km/h	0.0 mm	High 30
15 Aug	35.9 °C	29 %	21 km/h	0.0 mm	High 32
16 Aug	35.7 °C	36 %	19 km/h	0.0 mm	High 32
17 Aug	35.1 °C	41 %	25 km/h	1.2 mm	High 23
18 Aug	35.7 °C	36 %	22 km/h	0.1 mm	High 26
19 Aug	36.2 °C	38 %	20 km/h	0.1 mm	High 26
20 Aug	36.8 °C	34 %	21 km/h	0.0 mm	High 28
21 Aug	35.1 °C	43 %	28 km/h	0.1 mm	High 30
22 Aug	36.3 °C	38 %	28 km/h	0.0 mm	High 28
23 Aug	37.7 °C	32 %	30 km/h	0.0 mm	High 32
24 Aug	37.6 °C	34 %	26 km/h	0.0 mm	High 35
25 Aug	28.7 °C	46 %	41 km/h	0.0 mm	High 32
26 Aug	27.0 °C	32 %	37 km/h	0.0 mm	High 31
27 Aug	32.0 °C	31 %	20 km/h	0.0 mm	High 28
28 Aug	33.5 °C	36 %	16 km/h	0.0 mm	High 28
29 Aug	35.7 °C	33 %	15 km/h	0.0 mm	High 28
30 Aug	35.9 °C	34 %	18 km/h	0.0 mm	High 30
31 Aug	36.2 °C	37 %	20 km/h	0.0 mm	High 30
1 Sept	36.4 °C	34 %	27 km/h	0.0 mm	High 33
2 Sept	34.2 °C	31 %	34 km/h	0.0 mm	High 33
3 Sept	36.0 °C	34 %	18 km/h	0.0 mm	High 32
4 Sept after	37.1 °C	35 %	20 km/h	0.0 mm	High 30
5 Sept after	32.0 °C	64 %	29 km/h	7.0 mm	Very low 4

Before and after, from space

Drag the line to compare the same ground before the fire and after it.

↔

Before · 3 Aug 2024

After · 10 Sept 2024

Before After

If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.

The smoke

CAMS · Copernicus

On 27 August 2024 the air beside the fire reached 265 µg/m³ of PM2.5. That day averaged 159: 11 times the WHO daily guideline (15).

PM2.5 peak265 µg/m³

Days over the guideline18 days

PM10379 µg/m³

Optical depth3.55

WHO 15

15161718192021222324252627282930311

Good Fair Moderate Poor Very poor Extremely poor

Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.

Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)

Detections table · 264Every satellite heat detection, one by one, with time, satellite, power and coordinates.

⬇ Download CSV Times in UTC. Each detection is a 375 m pixel: a large fire yields hundreds per pass.

Date and time	Satellite	FRP (MW)	Lat	Lon

Other fires nearby

All fires in Brazil ›

Frequently asked questions

How long did the Boca do Acre fire last?: According to the heat detections seen by satellite inside the perimeter, it burned from 10 August 2024 to 3 September 2024 (25 days). The perimeter dates it from 17 August 2024 to 29 August 2024.
How much area did it burn?: The perimeter GWIS (Copernicus) rebuilt from heat detections is 3,899 hectares (39.0 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire only entered Boca do Acre (3,928 ha, 0.2 %).
What was the weather like?: During the fire the temperature reached 37.7 °C, humidity dropped to 27 % and gusts hit 43 km/h. The fire danger index (FWI) reached 35, class High.
Where does this data come from?: From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Brazil (geoBoundaries). It is not an official report.

Where to verify it

A satellite detection is not an official report. Final figures and the fire’s status are published by each country’s emergency service.

Emergency number: 193 · Emergency number and official warnings ›

INPE · Programa Queimadas ↗
IBAMA · Prevfogo ↗

Satellite cross-check

NASA FIRMS ↗
GWIS · Copernicus ↗

History of this page · 2 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.

25 October 2026 Last day with fire: 29 August 2024 → 3 September 2024.
25 October 2026 Start date: 17 August 2024 → 10 August 2024.

RSS Changes to this page

Does something look wrong on this page?

This page is built from satellite data and official records, and it sometimes gets things wrong: the wrong dates, the wrong town, two fires merged into one, or something that was not a wildfire at all. If you know this fire first-hand (you live nearby, saw it, fought it or reported on it), tell us what really happened and we will check it.

Report an error

What do you think is wrong?

Dates or duration Place or towns Burned area Name It was not a wildfire Same fire as another page Something else

What really happened?

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We will only use your email to reply about this report. Privacy. This is not an emergency service: if there is a fire now, call 193.

How we know this

Perimeter: GWIS (Copernicus), rebuilt from heat detections rather than mapped on imagery.
Dates adjusted with the VIIRS detections inside the perimeter, which said 17 August 2024 to 29 August 2024. 264 Suomi-NPP VIIRS detections on those dates.
We have not matched this page with any official record.
Weather: Copernicus ERA5 reanalysis at the fire location, in cells of about 25 km.
Built-up area and population come from the JRC Global Human Settlement Layer (epoch 2025, 100 m cells), summed inside the perimeter: an estimate of what was there, not a damage count.

How we build fire pages: methodology ›

Where this data comes from

The perimeter comes from the Copernicus Global Wildfire Information System (GWIS), which rebuilds it from MODIS and VIIRS heat detections and publishes it under CC BY 4.0. It is not measured on imagery as in Europe, so it is an estimate. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Municipal boundaries come from geoBoundaries ADM2 (Creative Commons Attribution 3.0 Intergovernmental Organisations (CC BY 3.0 IGO)). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ from each country’s official figure.

Where it burned