Skip to content
worldfires
en
BR · Brazil · →

Pimenteiras fire, October 2025 Pimenteiras, Aroazes, São Miguel do Tapuio

Out · last detection 25 Nov 2025, 16:55 UTC

The fire started on 9 October 2025 in Pimenteiras, Brazil, and satellites saw it burning for 48 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 34,978 hectares from heat detections, spread across 3 municipalities.

This page is probably a fire complex, not a single fire. GWIS merges into one perimeter the fires that touch over weeks, which in large burning seasons can join dozens of separate fires. The total area is reliable; the origin and dates refer to the whole complex.

Other fire pages in the same area and on the same dates:

It is the 8th largest in Piaui since 2016 (of 804 with a page). Number 14 in Brazil in 2025, of 714.

Compare with…

Suggestions: Pimenteiras · 2020São Miguel do Tapuio · 2020Aroazes · 2026Lagoa do Sítio · 2021

Burnt area
34,978ha
GWIS perimeter (Copernicus)
Duration
48days
9 Oct 2025 – 25 Nov 2025
Municipalities hit
3
municipalities
Started on
9 Oct
2025
Heat detections
1,204
in a single hotspot: 171 MW
Danger at start
51
Extreme · FWI index
Average daily power
198MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 9 Oct25 Nov
25 Nov 2025

How it evolved, day by day

9 Oct 2025 · 18 MW · 3 10 Oct 2025 · 117 MW · 10 11 Oct 2025 · 31 MW · 6 12 Oct 2025 · 61 MW · 9 13 Oct 2025 · 14 MW · 5 14 Oct 2025 · 629 MW · 87 15 Oct 2025 · 465 MW · 63 16 Oct 2025 · 457 MW · 66 17 Oct 2025 · 188 MW · 64 18 Oct 2025 · 106 MW · 7 19 Oct 2025 · 4 MW · 4 20 Oct 2025 · 56 MW · 12 23 Oct 2025 · 51 MW · 5 24 Oct 2025 · 53 MW · 15 25 Oct 2025 · 191 MW · 38 26 Oct 2025 · 398 MW · 58 27 Oct 2025 · 1,076 MW · 74 28 Oct 2025 · 106 MW · 26 29 Oct 2025 · 686 MW · 106 30 Oct 2025 · 914 MW · 173 31 Oct 2025 · 237 MW · 36 1 Nov 2025 · 24 MW · 4 2 Nov 2025 · 59 MW · 3 3 Nov 2025 · 59 MW · 9 4 Nov 2025 · 654 MW · 67 5 Nov 2025 · 273 MW · 55 6 Nov 2025 · 29 MW · 5 7 Nov 2025 · 56 MW · 6 8 Nov 2025 · 19 MW · 9 10 Nov 2025 · 108 MW · 5 11 Nov 2025 · 18 MW · 7 13 Nov 2025 · 159 MW · 27 14 Nov 2025 · 166 MW · 65 15 Nov 2025 · 131 MW · 25 16 Nov 2025 · 165 MW · 28 17 Nov 2025 · 85 MW · 8 18 Nov 2025 · 20 MW · 5 21 Nov 2025 · 4 MW · 1 24 Nov 2025 · 4 MW · 2 25 Nov 2025 · 17 MW · 6
9 Oct 15 Oct 23 Oct 27 Oct 29 Oct 4 Nov 11 Nov 18 Nov

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
50km/h · peak gust
17%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: 5,163 ha in 2020.

How big is it?

10 km
It burned the equivalent of 22% of the area of London (350 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

  1. Pimenteiras 11,341 inhabitants where it started
    23,558 ha reached on 9 Oct
    5.1 %
  2. Aroazes 5,369 inhabitants
    7,970 ha reached on 11 Oct
    9.6 %
  3. São Miguel do Tapuio 17,554 inhabitants
    3,671 ha reached on 10 Nov
    0.7 %

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 area0.23 ha
Residents< 20

Inside the perimeter there were about 0.23 hectares of 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)
9 Oct 36.9 °C 22 % 40 km/h 0.0 mm Extreme 51
10 Oct 36.8 °C 23 % 43 km/h 0.0 mm Extreme 53
11 Oct 37.0 °C 20 % 47 km/h 0.0 mm Extreme 56
12 Oct 37.3 °C 18 % 41 km/h 0.0 mm Extreme 53
13 Oct 37.0 °C 20 % 38 km/h 0.0 mm Extreme 51
14 Oct 36.7 °C 17 % 41 km/h 0.0 mm Extreme 54
15 Oct 36.5 °C 18 % 43 km/h 0.0 mm Extreme 56
16 Oct 36.5 °C 17 % 45 km/h 0.0 mm Extreme 56
17 Oct 36.0 °C 25 % 37 km/h 0.0 mm Very high 48
18 Oct 36.8 °C 24 % 38 km/h 0.0 mm Very high 49
19 Oct 38.2 °C 22 % 29 km/h 0.0 mm Very high 44
20 Oct 35.4 °C 31 % 24 km/h 0.2 mm Very high 41
21 Oct 29.1 °C 52 % 41 km/h 6.8 mm Low 7
22 Oct 32.4 °C 37 % 46 km/h 0.0 mm High 27
23 Oct 34.2 °C 23 % 45 km/h 0.0 mm Very high 41
24 Oct 34.5 °C 27 % 49 km/h 0.0 mm Very high 43
25 Oct 35.0 °C 22 % 47 km/h 0.0 mm Very high 44
26 Oct 35.4 °C 21 % 49 km/h 0.0 mm Very high 48
27 Oct 36.3 °C 20 % 43 km/h 0.0 mm Very high 46
28 Oct 35.8 °C 21 % 48 km/h 0.0 mm Very high 49
29 Oct 36.0 °C 24 % 50 km/h 0.0 mm Extreme 51
30 Oct 37.3 °C 20 % 42 km/h 0.0 mm Very high 47
31 Oct 35.8 °C 29 % 33 km/h 0.0 mm Very high 43
1 Nov 35.1 °C 35 % 34 km/h 0.1 mm Very high 38
2 Nov 35.5 °C 29 % 33 km/h 0.0 mm Very high 39
3 Nov 36.0 °C 26 % 39 km/h 0.0 mm Very high 43
4 Nov 37.7 °C 21 % 29 km/h 0.0 mm Very high 41
5 Nov 37.3 °C 23 % 32 km/h 0.0 mm Very high 45
6 Nov 35.4 °C 28 % 31 km/h 0.0 mm Very high 41
7 Nov 36.9 °C 22 % 25 km/h 0.0 mm Very high 39
8 Nov 35.1 °C 31 % 29 km/h 0.0 mm High 37
9 Nov 36.2 °C 27 % 35 km/h 0.0 mm Very high 41
10 Nov 36.9 °C 25 % 39 km/h 0.0 mm Very high 45
11 Nov 36.3 °C 22 % 39 km/h 0.0 mm Very high 44
12 Nov 36.2 °C 20 % 37 km/h 0.0 mm Very high 44
13 Nov 36.0 °C 18 % 40 km/h 0.0 mm Very high 48
14 Nov 35.9 °C 21 % 49 km/h 0.0 mm Extreme 55
15 Nov 36.6 °C 21 % 46 km/h 0.0 mm Extreme 52
16 Nov 37.0 °C 22 % 44 km/h 0.0 mm Extreme 51
17 Nov 38.3 °C 20 % 39 km/h 0.0 mm Very high 48
18 Nov 37.1 °C 26 % 35 km/h 0.0 mm Very high 47
19 Nov 31.9 °C 39 % 32 km/h 0.6 mm High 35
20 Nov 29.5 °C 46 % 26 km/h 2.5 mm Low 11
21 Nov 33.1 °C 37 % 28 km/h 0.0 mm High 25
22 Nov 34.9 °C 32 % 36 km/h 0.0 mm High 34
23 Nov 36.1 °C 25 % 40 km/h 0.0 mm Very high 41
24 Nov 36.0 °C 21 % 44 km/h 0.0 mm Very high 46
25 Nov 36.2 °C 22 % 44 km/h 0.0 mm Very high 46
26 Nov after 36.8 °C 25 % 35 km/h 0.0 mm Very high 44
27 Nov after 36.1 °C 26 % 35 km/h 0.0 mm Very high 41
28 Nov after 36.1 °C 23 % 36 km/h 0.0 mm Very high 47
29 Nov after 35.5 °C 26 % 42 km/h 0.0 mm Very high 47
30 Nov after 35.4 °C 26 % 35 km/h 0.0 mm Very high 45
1 Dec after 33.0 °C 39 % 25 km/h 0.1 mm High 32
2 Dec after 31.6 °C 44 % 30 km/h 0.3 mm High 31
3 Dec after 34.8 °C 29 % 34 km/h 0.0 mm High 36
4 Dec after 35.9 °C 26 % 34 km/h 0.0 mm Very high 39
5 Dec after 31.4 °C 44 % 22 km/h 0.4 mm High 28

Before and after, from space

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

Before · 2 Oct 2025
After · 2 Dec 2025

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 20 November 2025 the air beside the fire reached 21 µg/m³ of PM2.5. That day averaged 15: 1.0 times the WHO daily guideline (15).

PM2.5 peak21 µg/m³
Days over the guideline1 day
PM1024 µg/m³
Optical depth0.56
78910111213141516171819202122232425262728293031123456789101112131415161718192021
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 · 1,204Every 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 timeSatelliteFRP (MW)LatLon

Other fires nearby

All fires in Brazil ›

Frequently asked questions

How long did the Pimenteiras fire last?
According to the heat detections seen by satellite inside the perimeter, it burned from 9 October 2025 to 25 November 2025 (48 days). The perimeter dates it from 12 October 2025 to 18 November 2025.
How much area did it burn?
The perimeter GWIS (Copernicus) rebuilt from heat detections is 34,978 hectares (349.8 km²). It is an estimate: official national figures may differ.
Which municipalities burned?
The fire entered 3 municipalities: Pimenteiras (23,558 ha, 5.1 %); Aroazes (7,970 ha, 9.6 %); São Miguel do Tapuio (3,671 ha, 0.7 %).
What was the weather like?
During the fire the temperature reached 38.3 °C, humidity dropped to 17 % and gusts hit 50 km/h. The fire danger index (FWI) reached 56, 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 ›

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.
  1. Last day with fire: 18 November 2025 → 25 November 2025.
  2. Start date: 12 October 2025 → 9 October 2025.

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?

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; 3 polygons grouped in this page.
  • Dates adjusted with the VIIRS detections inside the perimeter, which said 12 October 2025 to 18 November 2025. 1,204 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.