Orán fire, October 2025 Orán, General José de San Martín
The fire started on 3 October 2025 in Orán, Argentina, and satellites saw it burning for 14 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 5,086 hectares from heat detections, spread across 2 municipalities.
It is the 19th largest in Salta since 2016 (of 231 with a page). Number 27 in Argentina in 2025, of 206.
- Burnt area
- 5,086ha
- GWIS perimeter (Copernicus)
- Duration
- 14days
- 3 Oct 2025 – 16 Oct 2025
- Municipalities hit
- 2
- departments
- Started on
- 3 Oct
- 2025
- Heat detections
- 475
- in a single hotspot: 148 MW
- Danger at start
- 30
- High · FWI index
- Energy released
- 5.5GW
- sum of detected power
Where it burned
How it evolved, day by day
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
It had gone one day without rain (1 mm or more) when it started. Rain came after the fire: 7.7 mm on 17 Oct.
This area had burned before
82% of the perimeter overlaps earlier fires recorded since 2016: 36 ha in 2017, 1,772 ha in 2020, 2,570 ha in 2021, 812 ha in 2022, 863 ha in 2023, 668 ha in 2024. Part of it burned more than once, so the yearly figures add up to more than the 4,150 ha that had burned before.
- 1,584 ha Orán fire, October 2021 1,720 ha in total; the hectares shown are those it shares with this fire
- 1,531 ha Orán fire, October 2020 1,914 ha in total; the hectares shown are those it shares with this fire
- 986 ha Orán fire, October 2021 2,011 ha in total; the hectares shown are those it shares with this fire
- 45 ha General José de San Martín fire, October 2022 78,447 ha in total; the hectares shown are those it shares with this fire
What happened to each town
-
Orán where it started5,077 ha reached on 3 Oct0.4 %
-
24 ha0.0 %
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) |
|---|---|---|---|---|---|
| 3 Oct | 36.5 °C | 21 % | 29 km/h | 0.0 mm | High 30 |
| 4 Oct | 40.0 °C | 23 % | 28 km/h | 0.0 mm | High 32 |
| 5 Oct | 42.5 °C | 18 % | 48 km/h | 0.0 mm | Very high 48 |
| 6 Oct | 30.4 °C | 20 % | 45 km/h | 0.0 mm | Very high 46 |
| 7 Oct | 28.4 °C | 11 % | 20 km/h | 0.0 mm | High 34 |
| 8 Oct | 31.2 °C | 11 % | 22 km/h | 0.0 mm | High 33 |
| 9 Oct | 33.8 °C | 12 % | 20 km/h | 0.0 mm | High 34 |
| 10 Oct | 38.1 °C | 11 % | 30 km/h | 0.0 mm | Very high 43 |
| 11 Oct | 39.7 °C | 14 % | 24 km/h | 0.0 mm | Very high 44 |
| 12 Oct | 32.6 °C | 16 % | 59 km/h | 0.0 mm | Extreme 59 |
| 13 Oct | 33.8 °C | 16 % | 24 km/h | 0.0 mm | Very high 40 |
| 14 Oct | 35.5 °C | 18 % | 38 km/h | 0.0 mm | Very high 48 |
| 15 Oct | 38.4 °C | 23 % | 28 km/h | 0.0 mm | Very high 43 |
| 16 Oct | 41.8 °C | 19 % | 41 km/h | 0.4 mm | Very high 48 |
| 17 Oct after | 35.0 °C | 41 % | 34 km/h | 7.7 mm | Low 7 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
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 · CopernicusOn 10 October 2025 the air beside the fire reached 54 µg/m³ of PM2.5. That day averaged 35: 2.4 times the WHO daily guideline (15).
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 · 475Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 78,447 haGeneral José de San Martín23 October 2022 · 48 days · 24 km away
- 7,996 haOrán4 September 2022 · 16 days · 25 km away
- 7,264 haOrán24 September 2025 · 23 days · 26 km away
- 4,248 haOrán5 October 2022 · 9 days · 27 km away
- 4,651 haGeneral José de San Martín11 October 2025 · 6 days · 31 km away
- 63,108 haOrán21 October 2022 · 31 days · 39 km away
Frequently asked questions
- How long did the Orán fire last?
- GWIS (Copernicus) dates it between 3 October 2025 and 16 October 2025: 14 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 5,086 hectares (50.9 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 2 municipalities: Orán (5,077 ha, 0.4 %); General José de San Martín (24 ha, 0.0 %).
- What was the weather like?
- During the fire the temperature reached 42.5 °C, humidity dropped to 11 % and gusts hit 59 km/h. The fire danger index (FWI) reached 59, class Extreme.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Argentina (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: 911 · 100
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
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.