Lábrea fire, 17 September 2023 Lábrea
The fire started on 17 September 2023 in Lábrea, Brazil, and satellites saw it burning for 20 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 3,888 hectares from heat detections, spread across a single municipality.
It is the 272th largest in Amazonas since 2016 (of 450 with a page). Number 267 in Brazil in 2023, of 431.
Compare with…
Suggestions: Lábrea · 2022Lábrea · 2020Lábrea · 2021Lábrea · 2016
- Burnt area
- 3,888ha
- GWIS perimeter (Copernicus)
- Duration
- 20days
- 17 Sept 2023 – 6 Oct 2023
- Municipalities hit
- 1
- municipalities
- Started on
- 17 Sept
- 2023
- Heat detections
- 301
- in a single hotspot: 120 MW
- Danger at start
- 6
- Low · FWI index
- Average daily power
- 244MW
- detected power per day, on average
Where it burned
How it evolved, day by day
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
It had gone 0 days without rain (1 mm or more) when it started. Rain came after the fire: 1.3 mm on 10 Oct.
This area had burned before
100% of the perimeter overlaps earlier fires recorded since 2016: 1,310 ha in 2016, 1,078 ha in 2017, 848 ha in 2018, 1,968 ha in 2019, 4,624 ha in 2020, 3,280 ha in 2021, 4,208 ha in 2022. Part of it burned more than once, so the yearly figures add up to more than the 3,900 ha that had burned before.
- 2,941 ha Lábrea fire, August 2022 19,125 ha in total; the hectares shown are those it shares with this fire
- 2,628 ha Lábrea fire, August 2020 3,635 ha in total; the hectares shown are those it shares with this fire
- 2,085 ha Lábrea fire, August 2021 27,355 ha in total; the hectares shown are those it shares with this fire
- 561 ha Lábrea fire, July 2016 4,633 ha in total; the hectares shown are those it shares with this fire
- 313 ha Lábrea fire, August 2018 3,083 ha in total; the hectares shown are those it shares with this fire
How big is it?
London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).
Paris boundary: geoBoundaries · Institut national de l'information géographique et forestière (IGN-F) (Etalab Open License 2.0).
Madrid boundary: geoBoundaries · Open Data ESRI, IGN Central Registry of Cartography Area (CC BY 4.0).
Berlin boundary: geoBoundaries · Federal Agency for Cartography and Geodesy (dl-de/by-2-0).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
3,916 ha reached on 21 Sept0.1 %
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 2025Inside 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) |
|---|---|---|---|---|---|
| 21 Sept | 34.5 °C | 41 % | 18 km/h | 0.7 mm | Low 6 |
| 22 Sept | 35.8 °C | 39 % | 22 km/h | 0.1 mm | Moderate 13 |
| 23 Sept | 36.4 °C | 35 % | 24 km/h | 0.0 mm | Moderate 18 |
| 24 Sept | 36.7 °C | 33 % | 22 km/h | 0.0 mm | Moderate 19 |
| 25 Sept | 36.2 °C | 38 % | 26 km/h | 0.0 mm | Moderate 20 |
| 26 Sept | 36.3 °C | 42 % | 31 km/h | 0.2 mm | Moderate 20 |
| 27 Sept | 37.2 °C | 40 % | 23 km/h | 0.2 mm | Moderate 21 |
| 28 Sept | 36.4 °C | 42 % | 21 km/h | 3.6 mm | Low 7 |
| 29 Sept | 34.0 °C | 53 % | 25 km/h | 1.9 mm | Very low 5 |
| 30 Sept | 33.4 °C | 55 % | 26 km/h | 3.4 mm | Very low 2 |
| 1 Oct | 35.1 °C | 44 % | 18 km/h | 0.1 mm | Low 10 |
| 2 Oct | 36.8 °C | 38 % | 26 km/h | 0.0 mm | Moderate 15 |
| 3 Oct | 37.3 °C | 37 % | 29 km/h | 0.0 mm | Moderate 19 |
| 4 Oct | 36.1 °C | 41 % | 30 km/h | 0.5 mm | Moderate 18 |
| 5 Oct | 36.2 °C | 46 % | 31 km/h | 0.3 mm | Moderate 19 |
| 6 Oct | 37.4 °C | 37 % | 36 km/h | 0.0 mm | Moderate 21 |
| 7 Oct after | 36.7 °C | 38 % | 35 km/h | 0.0 mm | Moderate 21 |
| 8 Oct after | 36.8 °C | 41 % | 26 km/h | 0.1 mm | Moderate 21 |
| 9 Oct after | 36.9 °C | 35 % | 29 km/h | 0.0 mm | Moderate 21 |
| 10 Oct after | 36.7 °C | 37 % | 22 km/h | 1.3 mm | Moderate 15 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
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 · CopernicusOn 24 September 2023 the air beside the fire reached 64 µg/m³ of PM2.5. That day averaged 42: 2.8 times the WHO daily guideline (15).
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 · 301Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 19,125 haLábrea18 August 2022 · 31 days · 9 km away
- 8,888 haLábrea7 August 2024 · 23 days · 12 km away
- 27,355 haLábrea8 August 2021 · 30 days · 14 km away
- 6,568 haLábrea4 August 2019 · 17 days · 15 km away
- 12,629 haLábrea24 August 2024 · 13 days · 21 km away
- 7,995 haLábrea8 August 2024 · 29 days · 36 km away
Frequently asked questions
- How long did the Lábrea fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 17 September 2023 to 6 October 2023 (20 days). The perimeter dates it from 21 September 2023 to 29 September 2023.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 3,888 hectares (38.9 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Lábrea (3,916 ha, 0.1 %).
- What was the weather like?
- During the fire the temperature reached 37.4 °C, humidity dropped to 33 % and gusts hit 36 km/h. The fire danger index (FWI) reached 21, class Moderate.
- 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 ›
Satellite cross-check
History of this page · 2 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Last day with fire: 29 September 2023 → 6 October 2023.
- Start date: 21 September 2023 → 17 September 2023.
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
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 21 September 2023 to 29 September 2023. 301 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.
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.