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Arraias fire, 26 July 2025 Paranã, Arraias

Out · last detection 6 Aug 2025, 16:32 UTC

The fire started on 26 July 2025 in Arraias, Brazil, and satellites saw it burning for 12 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 4,014 hectares from heat detections, spread across 2 municipalities.

It is the 673th largest in Tocantins since 2016 (of 1036 with a page). Number 366 in Brazil in 2025, of 526.

Compare with…

Suggestions: Teresina de Goiás · 2021Campos Belos · 2025Arraias · 2021Arraias · 2017

Burnt area
4,014ha
GWIS perimeter (Copernicus)
Duration
12days
26 Jul 2025 – 6 Aug 2025
Municipalities hit
2
municipalities
Started on
26 Jul
2025
Heat detections
125
in a single hotspot: 41 MW
Danger at start
38
Very high · FWI index
Average daily power
89MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 26 Jul6 Aug
6 Aug 2025

How it evolved, day by day

26 Jul 2025 · 12 MW · 2 28 Jul 2025 · 6 MW · 3 29 Jul 2025 · 21 MW · 11 30 Jul 2025 · 7 MW · 5 31 Jul 2025 · 410 MW · 36 1 Aug 2025 · 282 MW · 28 2 Aug 2025 · 49 MW · 10 3 Aug 2025 · 67 MW · 22 4 Aug 2025 · 23 MW · 6 6 Aug 2025 · 10 MW · 2
26 Jul 29 Jul 31 Jul 2 Aug 4 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

35°high
42km/h · peak gust
20%lowest humidity

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

This area had burned before

91% of the perimeter overlaps earlier fires recorded since 2016: 771 ha in 2016, 2,027 ha in 2017, 837 ha in 2018, 1,011 ha in 2019, 55 ha in 2020, 2,231 ha in 2021. Part of it burned more than once, so the yearly figures add up to more than the 3,666 ha that had burned before.

How big is it?

10 km
It burned the equivalent of 2.5% of the area of London (40 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. Paranã 10,542 inhabitants
    2,281 ha reached on 31 Jul
    0.2 %
  2. Arraias 10,287 inhabitants where it started
    1,762 ha reached on 26 Jul
    0.3 %

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)

Started with 60 days without rain: 55 % of the area in Brazil

Day High Min. humidity Peak gust Rain Danger (FWI)
26 Jul 33.3 °C 24 % 30 km/h 0.0 mm Very high 38
27 Jul 33.2 °C 20 % 33 km/h 0.0 mm Very high 40
28 Jul 33.2 °C 24 % 26 km/h 0.0 mm High 37
29 Jul 34.6 °C 21 % 17 km/h 0.0 mm High 36
30 Jul 34.5 °C 23 % 35 km/h 0.0 mm Very high 43
31 Jul 34.6 °C 25 % 42 km/h 0.0 mm Very high 47
1 Aug 32.8 °C 32 % 38 km/h 0.0 mm Very high 42
2 Aug 32.3 °C 21 % 36 km/h 0.0 mm Very high 41
3 Aug 31.5 °C 28 % 40 km/h 0.0 mm Very high 44
4 Aug 32.2 °C 27 % 34 km/h 0.0 mm Very high 40
5 Aug 33.2 °C 25 % 29 km/h 0.0 mm High 38
6 Aug 34.0 °C 24 % 39 km/h 0.0 mm Very high 44
7 Aug after 34.1 °C 26 % 29 km/h 0.0 mm Very high 40
8 Aug after 33.7 °C 24 % 24 km/h 0.0 mm High 38
9 Aug after 35.6 °C 20 % 23 km/h 0.0 mm Very high 38
10 Aug after 35.1 °C 22 % 31 km/h 0.0 mm Very high 42
11 Aug after 35.1 °C 21 % 34 km/h 0.0 mm Very high 44
12 Aug after 33.7 °C 20 % 30 km/h 0.0 mm Very high 42
13 Aug after 32.9 °C 32 % 32 km/h 0.0 mm Very high 40
14 Aug after 33.5 °C 31 % 34 km/h 0.0 mm Very high 39
15 Aug after 34.8 °C 21 % 36 km/h 0.0 mm Very high 44
16 Aug after 33.6 °C 24 % 40 km/h 0.0 mm Very high 47

Its twins: fires that started in the same weather

It started with an FWI of 38.3, a minimum humidity of 24% and more than two months without rain. Fires in the area that started in weather like this since 2016: 32.

FWI at the start 38.3
Minimum humidity 24 %
Days without rain 60+
this fire chosen twins rest of the area
Almost identicalSimilar

Outlines of the closest twins

Teresina de Goiás fire, September 2021
3,704 ha 11 days FWI 37.5 Min. humidity 24 % 52 km away, in 2021

First rain (1 mm or more) after it ended: 1.0 mm on 23 Sept.

See its page Compare with this fire

What happened to them

10 days
median duration
3,810 ha
median area
6 %
went past 10,000 ha
5.6 mm
rain at the end (median; 10 of 32 had it)

It burned an area similar to its twins (4,014 ha against a median of 3,810 ha) and lasted 12 days, against 10 days.

In 22 of 32, not even 1 mm fell in the ten days after the end: they went out without rain. In the rest, the first rainy day brought a median of 5.6 mm.

This is a bank of analogues: it shows what usually happens, not what will happen. With fewer than 15 twins we give no figures. How we calculate it

How it ended

—first rain
—no rain in ten days
42km/h · max. gust

It was considered over on 6 Aug, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 10 of 32, with a median of 5.6 mm.

Weather on this page: Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)

How a twin is chosen

  • Same area: fires that have already ended, less than 250 km from this one, since 2016.
  • Same start: we compare the FWI on the first day, the minimum humidity that day and the run of days without rain before it. The slider sets how much they may differ.
  • Only pages with final weather data (ERA5 reanalysis) calculated in the same way as this fire’s; agricultural and grass burns and pages with data under review are left out.
  • Fires burning at the same time as this one (a week before or after) are left out: they share the same spell of weather and do not count as a precedent.
  • They are sorted by similarity, and the outlines of the first five are drawn.

How we calculate it

Before and after, from space

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

Before · 19 Jul 2025
After · 13 Aug 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 30 July 2025 the air beside the fire reached 10 µg/m³ of PM2.5, but no daily average passed the WHO guideline (15).

PM2.5 peak10 µg/m³
Days over the guideline0 days
PM1010 µg/m³
Optical depth0.33
26 Jul29 Jul1 Aug4 Aug7 Aug
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 · 125Every 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 Arraias fire last?
According to the heat detections seen by satellite inside the perimeter, it burned from 26 July 2025 to 6 August 2025 (12 days). The perimeter dates it from 28 July 2025 to 4 August 2025.
How much area did it burn?
The perimeter GWIS (Copernicus) rebuilt from heat detections is 4,014 hectares (40.1 km²). It is an estimate: official national figures may differ.
Which municipalities burned?
The fire entered 2 municipalities: Paranã (2,281 ha, 0.2 %); Arraias (1,762 ha, 0.3 %).
What was the weather like?
During the fire the temperature reached 34.6 °C, humidity dropped to 20 % and gusts hit 42 km/h. The fire danger index (FWI) reached 47, class Very 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.
How did the fires that started in similar weather in this area end?
Fires less than 250 km away that started since 2016 with a similar FWI, humidity and dry spell: 32. Their median duration was 10 days and their median area 3,810 ha; 6 % went past 10,000 ha. In 22 of 32, not even 1 mm fell in the ten days after the end: they went out without rain. In the rest, the first rainy day brought a median of 5.6 mm.

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: 4 August 2025 → 6 August 2025.
  2. Start date: 28 July 2025 → 26 July 2025.

RSS Changes to this page With cross-checks and a citable version

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.
  • Dates adjusted with the VIIRS detections inside the perimeter, which said 28 July 2025 to 4 August 2025. 125 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.