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Uruçuí fire, 10 October 2025 Uruçuí

Out · last detection 14 Oct 2025, 04:04 UTC

The fire started on 10 October 2025 in Uruçuí, Brazil, and satellites saw it burning for 4 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 4,218 hectares from heat detections, spread across a single municipality.

It is the 467th largest in Piaui since 2016 (of 804 with a page). Number 442 in Brazil in 2025, of 714.

Burnt area
4,218ha
GWIS perimeter (Copernicus)
Duration
4days
10 Oct 2025 – 13 Oct 2025
Municipalities hit
1
municipalities
Started on
10 Oct
2025
Heat detections
126
in a single hotspot: 76 MW
Danger at start
53
Extreme · FWI index
Energy released
918MW
sum of detected power

Where it burned

14 Oct 2025
HOTSPOTS BY DAY 10 Oct13 Oct

How it evolved, day by day

1011121314

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
47km/h · peak gust
16%lowest humidity

It had gone more than two months without rain (1 mm or more) when it started. Rain came after the fire: 3.5 mm on 20 Oct.

This area had burned before

63% of the perimeter overlaps earlier fires recorded since 2016: 100 ha in 2016, 1,735 ha in 2017, 149 ha in 2018, 1,520 ha in 2020, 529 ha in 2023, 456 ha in 2024. Part of it burned more than once, so the yearly figures add up to more than the 2,651 ha that had burned before.

What happened to each town

  1. Uruçuí 25,203 inhabitants where it started
    4,243 ha reached on 10 Oct
    0.5 %

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

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 Oct 37.1 °C 24 % 40 km/h 0.0 mm Extreme 53
11 Oct 36.2 °C 22 % 41 km/h 0.0 mm Extreme 53
12 Oct 36.9 °C 24 % 33 km/h 0.0 mm Very high 48
13 Oct 37.7 °C 24 % 44 km/h 0.0 mm Extreme 52
14 Oct after 36.2 °C 22 % 36 km/h 0.1 mm Very high 49
15 Oct after 37.8 °C 18 % 40 km/h 0.0 mm Extreme 50
16 Oct after 38.4 °C 16 % 47 km/h 0.0 mm Extreme 60
17 Oct after 38.3 °C 17 % 41 km/h 0.0 mm Extreme 55
18 Oct after 37.5 °C 22 % 35 km/h 0.0 mm Very high 49
19 Oct after 34.9 °C 37 % 33 km/h 0.1 mm Very high 38
20 Oct after 30.8 °C 49 % 24 km/h 3.5 mm Low 8

Before and after, from space

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

Before · 3 Oct 2025
After · 20 Oct 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 14 October 2025 the air beside the fire reached 47 µg/m³ of PM2.5. That day averaged 27: 1.8 times the WHO daily guideline (15).

PM2.5 peak47 µg/m³
Days over the guideline1 day
PM1048 µg/m³
Optical depth0.55
8910111213141516
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 · 126Every 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 Uruçuí fire last?
GWIS (Copernicus) dates it between 10 October 2025 and 13 October 2025: 4 days between the first and last heat detection of the perimeter.
How much area did it burn?
The perimeter GWIS (Copernicus) rebuilt from heat detections is 4,218 hectares (42.2 km²). It is an estimate: official national figures may differ.
Which municipalities burned?
The fire only entered Uruçuí (4,243 ha, 0.5 %).
What was the weather like?
During the fire the temperature reached 38.4 °C, humidity dropped to 16 % and gusts hit 47 km/h. The fire danger index (FWI) reached 60, 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

Satellite cross-check

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.

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.