How long did the Santarém fire last?

GWIS (Copernicus) dates it between 4 October 2026 and 31 October 2026: 28 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 12,780 hectares (127.8 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire only entered Santarém (12,866 ha, 0.7 %).

Is the Santarém fire still active?

Yes: satellites detected fire on 31 Oct 2026, 05:10 UTC. Check the emergency service for the official status.

What was the weather like?

During the fire the temperature reached 37.9 °C, humidity dropped to 29 % and gusts hit 42 km/h. The fire danger index (FWI) reached 34, class 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.

BR · Brazil · 2026-10-04 → 2026-10-31

Santarém fire, October 2026 Santarém

Burning · last detection 31 Oct 2026, 05:10 UTC

The fire started on 4 October 2026 in Santarém, Brazil, and satellites saw it burning for 28 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 12,780 hectares from heat detections, spread across a single municipality.

It is the 165th largest in Pará since 2016 (of 1105 with a page). Number 85 in Brazil in 2026, of 768.

Compare with…

Suggestions: Santarém · 2024 Prainha · 2023 Prainha · 2024 Santarém · 2023

Is it still active?

Satellites detected fire on 31 Oct 2026, 05:10 UTC. Everything suggests it is still burning. Satellites pass a few times a day and cloud or smoke can hide the fire: a lack of detections is not an official extinction. Each country’s emergency service declares a fire contained or out.

Burnt area: 12,780ha; GWIS perimeter (Copernicus)
Duration: 28days; 4 Oct 2026 – 31 Oct 2026
Municipalities hit: 1; municipalities
Started on: 4 Oct; 2026
Heat detections: 285; in a single hotspot: 145 MW
Danger at start: 22; High · FWI index
Average daily power: 136MW; detected power per day, on average

HOTSPOTS BY DAY 4 Oct31 Oct

Play back 31 Oct 2026

How it evolved, day by day

7 Oct 13 Oct 17 Oct 21 Oct 25 Oct 28 Oct 29 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

38°high

42km/h · peak gust

29%lowest humidity

It had gone 5 days without rain (1 mm or more) when it started.

This area had burned before

30% of the perimeter overlaps earlier fires recorded since 2016: 3,292 ha in 2023, 565 ha in 2024.

565 ha Santarém fire, November 2024 4,637 ha in total; the hectares shown are those it shares with this fire

How big is it?

It burned the equivalent of 8.1% of the area of London (128 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

Santarém 331,942 inhabitants where it started

12,866 ha reached on 7 Oct

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.

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) · forecast models, provisional until the ERA5 reanalysis arrives

Day	High	Min. humidity	Peak gust	Rain	Danger (FWI)
4 Oct	35.3 °C	43 %	31 km/h	0.9 mm	High 22
5 Oct	33.6 °C	58 %	39 km/h	0.6 mm	High 22
6 Oct	33.7 °C	48 %	42 km/h	0.9 mm	High 23
7 Oct	35.8 °C	35 %	40 km/h	0.0 mm	High 31
8 Oct	34.8 °C	44 %	35 km/h	0.0 mm	High 32
9 Oct	33.9 °C	47 %	35 km/h	0.0 mm	High 31
10 Oct	35.1 °C	43 %	35 km/h	0.0 mm	High 30
11 Oct	35.2 °C	44 %	37 km/h	0.1 mm	High 31
12 Oct	35.2 °C	45 %	35 km/h	0.1 mm	High 30
13 Oct	35.3 °C	46 %	32 km/h	0.3 mm	High 30
14 Oct	33.9 °C	45 %	38 km/h	0.1 mm	High 33
15 Oct	34.5 °C	40 %	35 km/h	0.0 mm	High 34
16 Oct	35.8 °C	39 %	27 km/h	0.0 mm	High 30
17 Oct	35.4 °C	41 %	30 km/h	0.6 mm	High 27
18 Oct	35.3 °C	43 %	28 km/h	3.5 mm	Moderate 14
19 Oct	34.6 °C	44 %	28 km/h	1.1 mm	Moderate 18
20 Oct	35.3 °C	44 %	31 km/h	4.9 mm	Low 8
21 Oct	34.4 °C	50 %	38 km/h	0.9 mm	Moderate 18
22 Oct	36.0 °C	36 %	38 km/h	0.1 mm	High 26
23 Oct	35.4 °C	40 %	30 km/h	0.3 mm	High 25
24 Oct	36.8 °C	36 %	29 km/h	0.1 mm	High 26
25 Oct	36.4 °C	44 %	36 km/h	0.0 mm	High 30
26 Oct	35.2 °C	43 %	35 km/h	0.9 mm	High 22
27 Oct	37.5 °C	33 %	30 km/h	0.6 mm	High 28
28 Oct	37.9 °C	29 %	30 km/h	0.0 mm	High 31
29 Oct	36.4 °C	40 %	30 km/h	1.8 mm	Moderate 19
30 Oct	34.6 °C	49 %	36 km/h	2.0 mm	Moderate 14
31 Oct	36.5 °C	35 %	31 km/h	0.0 mm	High 25

Before and after, from space

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

↔

Before · 27 Sept 2026

After · 30 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 18 October 2026 the air beside the fire reached 264 µg/m³ of PM2.5. That day averaged 89: 5.9 times the WHO daily guideline (15).

PM2.5 peak264 µg/m³

Days over the guideline27 days

PM10270 µg/m³

Optical depth2.15

WHO 15

2345678910111213141516171819202122232425262728

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 · 285Every 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 Santarém fire last?: GWIS (Copernicus) dates it between 4 October 2026 and 31 October 2026: 28 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 12,780 hectares (127.8 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire only entered Santarém (12,866 ha, 0.7 %).
Is the Santarém fire still active?: Yes: satellites detected fire on 31 Oct 2026, 05:10 UTC. Check the emergency service for the official status.
What was the weather like?: During the fire the temperature reached 37.9 °C, humidity dropped to 29 % and gusts hit 42 km/h. The fire danger index (FWI) reached 34, class 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.

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 · 7 Changes in area, dates, name, official record or merged pages, compared every night since 26 October 2026.

31 October 2026 Area: 12,174 → 12,780 ha.
30 October 2026 Area: 10,663 → 12,174 ha.
29 October 2026 Area: 3,976 → 10,663 ha.
29 October 2026 Start date: 13 October 2026 → 4 October 2026.
28 October 2026 Area: 3,860 → 3,976 ha.
27 October 2026 Area: 3,625 → 3,860 ha.
26 October 2026 Page published (3,625 ha).

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; 2 polygons grouped in this page.
Dates from the perimeter: the VIIRS detections inside it did not change them. 285 Suomi-NPP VIIRS detections on those dates.
We have not matched this page with any official record.
Weather: ECMWF IFS model, provisional until the ERA5 reanalysis arrives.

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.