How long did the Aroazes fire last?

According to the heat detections seen by satellite inside the perimeter, it burned from 6 September 2026 to 6 October 2026 (31 days). The perimeter dates it from 6 September 2026 to 29 September 2026.

How much area did it burn?

The perimeter GWIS (Copernicus) rebuilt from heat detections is 11,522 hectares (115.2 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire entered 3 municipalities: Pimenteiras (6,939 ha, 1.5 %); Valença do Piauí (2,825 ha, 2.1 %); Aroazes (1,831 ha, 2.2 %).

Is the Aroazes fire still active?

No fire detections since 7 Oct 2026, 16:58 UTC. A lack of detections is not an official extinction.

What was the weather like?

During the fire the temperature reached 39.3 °C, humidity dropped to 14 % and gusts hit 49 km/h. The fire danger index (FWI) reached 53, class Extreme.

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 · 2026-09-06 → 2026-10-06

Aroazes fire, September 2026 Pimenteiras, Valença do Piauí, Aroazes

Out · last detection 7 Oct 2026, 16:58 UTC

The fire started on 6 September 2026 in Aroazes, Brazil, and satellites saw it burning for 31 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 11,522 hectares from heat detections, spread across 3 municipalities.

It is the 88th largest in Piaui since 2016 (of 804 with a page). Number 96 in Brazil in 2026, of 751.

Compare with…

Suggestions: Pimenteiras · 2025 Lagoa do Sítio · 2021 Lagoa do Sítio · 2021

Burnt area: 11,522ha; GWIS perimeter (Copernicus)
Duration: 31days; 6 Sept 2026 – 6 Oct 2026
Municipalities hit: 3; municipalities
Started on: 6 Sept; 2026
Heat detections: 271; in a single hotspot: 355 MW
Danger at start: 43; Very high · FWI index
Average daily power: 310MW; detected power per day, on average

HOTSPOTS BY DAY 6 Sept6 Oct

Play back 7 Oct 2026

How it evolved, day by day

6 Sept 11 Sept 15 Sept 21 Sept 23 Sept 25 Sept 29 Sept 5 Oct

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

The weather it burned in

39°high

49km/h · peak gust

14%lowest humidity

It had gone more than two months without rain (1 mm or more) when it started.

This area had burned before

15% of the perimeter overlaps earlier fires recorded since 2016: 139 ha in 2023, 1,258 ha in 2024, 335 ha in 2025.

241 ha Pimenteiras fire, October 2025 34,978 ha in total; the hectares shown are those it shares with this fire

How big is it?

It burned the equivalent of 7.3% of the area of London (115 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

Pimenteiras 11,341 inhabitants

6,939 ha reached on 21 Sept

1.5 %
Valença do Piauí 22,279 inhabitants

2,825 ha reached on 7 Sept

2.1 %
Aroazes 5,369 inhabitants where it started

1,831 ha reached on 6 Sept

2.2 %

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 area0.16 ha

Residents≈ 20

Inside the perimeter there were about 0.16 hectares of built-up land and about 20 residents (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)
6 Sept	36.9 °C	23 %	32 km/h	0.0 mm	Very high 43
7 Sept	38.5 °C	21 %	32 km/h	0.0 mm	Very high 43
8 Sept	37.0 °C	23 %	42 km/h	0.0 mm	Very high 48
9 Sept	36.3 °C	20 %	40 km/h	0.0 mm	Very high 46
10 Sept	35.8 °C	23 %	42 km/h	0.0 mm	Very high 47
11 Sept	35.9 °C	23 %	40 km/h	0.0 mm	Very high 47
12 Sept	35.9 °C	24 %	44 km/h	0.0 mm	Very high 50
13 Sept	37.1 °C	14 %	37 km/h	0.0 mm	Very high 50
14 Sept	37.8 °C	14 %	38 km/h	0.0 mm	Extreme 51
15 Sept	37.0 °C	21 %	27 km/h	0.0 mm	Very high 46
16 Sept	38.2 °C	18 %	28 km/h	0.0 mm	Very high 48
17 Sept	36.5 °C	26 %	49 km/h	0.0 mm	Extreme 52
18 Sept	36.0 °C	24 %	45 km/h	0.0 mm	Extreme 51
19 Sept	36.8 °C	20 %	45 km/h	0.0 mm	Extreme 51
20 Sept	36.1 °C	22 %	46 km/h	0.0 mm	Extreme 53
21 Sept	37.5 °C	19 %	39 km/h	0.0 mm	Very high 49
22 Sept	38.1 °C	19 %	31 km/h	0.0 mm	Very high 44
23 Sept	39.2 °C	18 %	29 km/h	0.0 mm	Very high 44
24 Sept	39.3 °C	20 %	31 km/h	0.0 mm	Very high 46
25 Sept	36.8 °C	27 %	30 km/h	0.8 mm	High 35
26 Sept	37.4 °C	25 %	35 km/h	0.0 mm	Very high 40
27 Sept	37.3 °C	24 %	37 km/h	0.0 mm	Very high 42
28 Sept	36.5 °C	28 %	37 km/h	0.0 mm	Very high 44
29 Sept	37.0 °C	26 %	34 km/h	0.0 mm	Very high 43
30 Sept	37.7 °C	27 %	37 km/h	0.0 mm	Very high 44
1 Oct	37.8 °C	26 %	42 km/h	0.1 mm	Very high 46
2 Oct	37.4 °C	28 %	34 km/h	0.0 mm	Very high 43

Before and after, from space

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

↔

Before · 30 Aug 2026

After · 13 Oct 2026

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 24 September 2026 the air beside the fire reached 19 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).

PM2.5 peak19 µg/m³

Days over the guideline0 days

PM1020 µg/m³

Optical depth0.29

WHO 15

4567891011121314151617181920212223242526272829301

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 · 271Every 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 Aroazes fire last?: According to the heat detections seen by satellite inside the perimeter, it burned from 6 September 2026 to 6 October 2026 (31 days). The perimeter dates it from 6 September 2026 to 29 September 2026.
How much area did it burn?: The perimeter GWIS (Copernicus) rebuilt from heat detections is 11,522 hectares (115.2 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire entered 3 municipalities: Pimenteiras (6,939 ha, 1.5 %); Valença do Piauí (2,825 ha, 2.1 %); Aroazes (1,831 ha, 2.2 %).
Is the Aroazes fire still active?: No fire detections since 7 Oct 2026, 16:58 UTC. A lack of detections is not an official extinction.
What was the weather like?: During the fire the temperature reached 39.3 °C, humidity dropped to 14 % and gusts hit 49 km/h. The fire danger index (FWI) reached 53, class Extreme.
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 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.

No changes since 24 October 2026.

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?

Your connection to the fire (optional) Email (optional)

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 6 September 2026 to 29 September 2026. 271 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