Burned area
satellite only31,197ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 2 Sept 2025 – 24 Sept 2025
+− cross-check
No official record is matched to this page to compare it with.
BR · Brazil · –
Balsas fire, 2 September 2025 Lizarda, Balsas, Recursolândia
Out · last detection 24 Sept 2025, 16:15 UTC
The fire started on 2 September 2025 in Balsas, Brazil, and satellites saw it burning for 23 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 31,197 hectares from heat detections, spread across 3 municipalities.
It is the 7th largest in Maranhão since 2016 (of 531 with a page). Number 15 in Brazil in 2025, of 526.
Use this data
Compare with…
Use this data
Fire page data · version 2026-10-26matches the official recordwith caveatssatellite onlymodel
When copying, the sentence is
Tick the figures you want: they make up the lede and the CSV.
Duration by satellite
satellite only23days
2 Sept 2025 to 24 Sept 2025: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 24 Sept 2025, 16:15 UTC
+− cross-check
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.
Start
satellite only2 Sept 2025
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 2 Sept 2025
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only803
VIIRS detections at 375 m. Most intense hotspot: 218 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 2 Sept 2025 – 24 Sept 2025
+− cross-check
There is no official record to compare with. Each hotspot is a pixel detected in one satellite pass, not a separate fire.
The worst day
satellite only2,180MW
Total radiative power on 11 September 2025; hotspots that day: 168.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 11 Sept 2025
+− cross-check
Fire radiative power (FRP) measures the energy the fire gives off when the satellite passes. Added up by day, it compares intensity, not area.
Danger at the start
model70.3FWI · very extreme
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 60.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 2 Sept 2025, local noon
- Model
- ERA5 0,25° (ECMWF · Copernicus C3S) · Open-Meteo.com
+− cross-check
This is an index computed from weather model data, not a measurement of the fire nor an official warning. Danger warnings are issued by each country’s authority. Emergency number and official warnings
Weather during the fire
model39.0°C · 13% RH
High of 39.0 °C and minimum humidity of 13% on 10 September 2025; gusts of 55 km/h on 4 September 2025.
- Source
- weather model at the fire’s grid cell
- Date
- 2 Sept 2025 – 24 Sept 2025
- Model
- ERA5 0,25° (ECMWF · Copernicus C3S) · Open-Meteo.com
+− cross-check
These are model values for a cell of about 25 km, not from a weather station: they may differ from what was measured on the ground.
Living inside
model≈ 30people
Estimated residents inside the perimeter and 0.38 ha of built-up area (100 m grid, epoch 2025).
- Source
- GHSL R2023A · JRC
- Date
- calculated on 24 October 2026
+− cross-check
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.
This page’s change log has been kept since 24 October 2026: every night what it publishes is compared and the difference is logged. Anything earlier is reconstructed from each source’s date and marked as reconstructed.
Show
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
-
logLast day with fire: 21 September 2025 → 24 September 2025.
-
logStart date: 4 September 2025 → 2 September 2025.
-
· reconstructed GHSLPopulation and built-up area computed
What was saved on 26 October 2026
Every night a snapshot of what the page shows is saved. If anything changes, it appears in the list as a log entry.
- Area
- 31,197 ha
- Dates
- 2 Sept 2025 – 24 Sept 2025
- Name
- Balsas
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/balsas-2025-09-8?v=2026-10-26A version keeps the area, dates, name and official record; the area as it was logged (changes under 2% are not logged). The map, hotspots and weather always show today’s data.
Citation
A lede of about 60 words figures only, no adjectives
CSV for this fire balsas-2025-09-8.csv · daily, no individual hotspots
| fecha | focos_viirs | frp_mw | tmax_c | tmin_c | hr_min_pct | viento_max_kmh | racha_max_kmh | precip_mm | fwi | clase_fwi | dentro_del_incendio |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025-09-02 | 0 | 0 | 36 | 23.3 | 24 | 25.2 | 54.4 | 0 | 70.3 | muy_extremo | 1 |
| 2025-09-03 | 0 | 0 | 35.3 | 23.4 | 25 | 24.6 | 53.3 | 0 | 66.5 | extremo | 1 |
| 2025-09-04 | 9 | 17 | 35.6 | 23 | 26 | 25.1 | 54.7 | 0 | 67.2 | extremo | 1 |
| 2025-09-05 | 32 | 247 | 35.6 | 22.6 | 24 | 24.4 | 51.5 | 0 | 63.3 | extremo | 1 |
| 2025-09-06 | 28 | 236 | 36.4 | 22.3 | 20 | 19.5 | 43.2 | 0 | 57.6 | extremo | 1 |
| 2025-09-07 | 12 | 99 | 37.7 | 23.2 | 19 | 20.1 | 45 | 0 | 59.8 | extremo | 1 |
| 2025-09-08 | 14 | 59 | 36.9 | 25 | 22 | 21.7 | 45 | 0 | 60.9 | extremo | 1 |
| 2025-09-09 | 25 | 375 | 37.1 | 25.7 | 17 | 22.4 | 47.5 | 0 | 64.4 | extremo | 1 |
| 2025-09-10 | 92 | 536 | 39 | 22.4 | 13 | 17.1 | 39.2 | 0 | 65.8 | extremo | 1 |
| 2025-09-11 | 168 | 2,180 | 38.7 | 21.3 | 18 | 10.3 | 27.7 | 0 | 57.2 | extremo | 1 |
| 2025-09-12 | 134 | 1,260 | 37.3 | 24.7 | 20 | 19.9 | 45 | 0 | 60.8 | extremo | 1 |
| 2025-09-13 | 21 | 152 | 36.2 | 24.4 | 23 | 11.9 | 30.6 | 0 | 49.8 | muy_alto | 1 |
| 2025-09-14 | 46 | 550 | 37.7 | 21.9 | 20 | 11.3 | 28.8 | 0 | 52.4 | extremo | 1 |
| 2025-09-15 | 64 | 440 | 38.2 | 25.1 | 17 | 14.6 | 32 | 0 | 54.5 | extremo | 1 |
| 2025-09-16 | 55 | 212 | 37.3 | 25.3 | 23 | 18.6 | 40.7 | 0 | 50.9 | extremo | 1 |
| 2025-09-17 | 49 | 542 | 37.7 | 25.8 | 22 | 18.8 | 41.8 | 0 | 55.7 | extremo | 1 |
| 2025-09-18 | 40 | 304 | 37.5 | 25.6 | 23 | 11.7 | 28.4 | 0 | 51.9 | extremo | 1 |
| 2025-09-19 | 5 | 64 | 36.3 | 24.1 | 27 | 9 | 21.2 | 0 | 48.3 | muy_alto | 1 |
| 2025-09-20 | 1 | 8 | 35.9 | 25.4 | 26 | 15.5 | 34.2 | 0 | 50.6 | extremo | 1 |
| 2025-09-21 | 2 | 4 | 32.6 | 23.8 | 41 | 14.7 | 28.1 | 1 | 33.2 | alto | 1 |
| 2025-09-22 | 0 | 0 | 34.3 | 22.5 | 45 | 13.1 | 30.6 | 1.6 | 34.5 | alto | 1 |
| 2025-09-23 | 0 | 0 | 33.9 | 23.8 | 40 | 8.6 | 29.9 | 0.9 | 21.2 | moderado | 1 |
| 2025-09-24 | 6 | 56 | 38 | 22.5 | 26 | 16.1 | 37.8 | 0 | 47.2 | muy_alto | 1 |
| 2025-09-25 | 0 | 0 | 36.4 | 24.1 | 26 | 19.1 | 42.1 | 0 | 47.4 | muy_alto | 0 |
| 2025-09-26 | 0 | 0 | 35.9 | 23.6 | 27 | 18 | 39.2 | 0 | 51 | extremo | 0 |
| 2025-09-27 | 0 | 0 | 35.6 | 23.7 | 25 | 19.6 | 44.3 | 0 | 50.9 | extremo | 0 |
| 2025-09-28 | 0 | 0 | 36.6 | 25.7 | 21 | 23.2 | 49 | 0 | 58.9 | extremo | 0 |
| 2025-09-29 | 0 | 0 | 37.1 | 25.3 | 24 | 18.5 | 41.8 | 0 | 53 | extremo | 0 |
| 2025-09-30 | 0 | 0 | 37.7 | 24 | 21 | 18.5 | 41.4 | 0 | 57.4 | extremo | 0 |
| 2025-10-01 | 0 | 0 | 37.5 | 26 | 23 | 16.7 | 36.7 | 0 | 49 | muy_alto | 0 |
| 2025-10-02 | 0 | 0 | 37.9 | 23.5 | 18 | 13.8 | 34.2 | 0 | 48.6 | muy_alto | 0 |
| 2025-10-03 | 0 | 0 | 37.5 | 22.1 | 22 | 17.1 | 36.7 | 0 | 53.3 | extremo | 0 |
| 2025-10-04 | 0 | 0 | 36.7 | 25.1 | 22 | 24.8 | 52.2 | 0 | 61.9 | extremo | 0 |
It is generated in your browser from this page’s data: one file per fire, aggregated by day and without individual hotspots.
Live widget for your story
It updates itself while the fire is still active and links to this page. Free, with the attribution shown at the bottom.
Sources for this page: GWIS (Copernicus), NASA FIRMS (VIIRS), ERA5 (ECMWF/Copernicus C3S) · Open-Meteo.com (CC BY 4.0), GHSL (JRC). Open-Meteo.com · How we build fire pages: methodology
- Burnt area
- 31,197ha
- GWIS perimeter (Copernicus)
- Duration
- 23days
- 2 Sept 2025 – 24 Sept 2025
- Municipalities hit
- 3
- municipalities
- Started on
- 2 Sept
- 2025
- Heat detections
- 803
- in a single hotspot: 218 MW
- Danger at start
- 70
- Very extreme · FWI index
- Average daily power
- 386MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
2 Sept24 Sept
24 Sept 2025
How it evolved, day by day
4 Sept
8 Sept
11 Sept
16 Sept
20 Sept
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
39°high
55km/h · peak gust
13%lowest humidity
It had gone more than two months without rain (1 mm or more) when it started.
This area had burned before
65% of the perimeter overlaps earlier fires recorded since 2016: 4,687 ha in 2016, 5,742 ha in 2017, 2,328 ha in 2019, 10,205 ha in 2020, 991 ha in 2021, 4,494 ha in 2022, 2,204 ha in 2023, 1,008 ha in 2024. Part of it burned more than once, so the yearly figures add up to more than the 20,406 ha that had burned before.
- 4,052 ha Balsas fire, September 2020 4,217 ha in total; the hectares shown are those it shares with this fire
- 3,706 ha Recursolândia fire, September 2020 16,504 ha in total; the hectares shown are those it shares with this fire
- 3,541 ha Balsas fire, August 2017 5,931 ha in total; the hectares shown are those it shares with this fire
- 1,843 ha Lizarda fire, September 2022 3,121 ha in total; the hectares shown are those it shares with this fire
- 1,668 ha Lizarda fire, October 2022 3,840 ha in total; the hectares shown are those it shares with this fire
- 547 ha Lizarda fire, September 2020 8,008 ha in total; the hectares shown are those it shares with this fire
- 61 ha Lizarda fire, August 2024 23,543 ha in total; the hectares shown are those it shares with this fire
- 1 ha Recursolândia fire, August 2024 12,261 ha in total; the hectares shown are those it shares with this fire
How big is it?
London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).
Paris boundary: geoBoundaries · Institut national de l'information géographique et forestière (IGN-F) (Etalab Open License 2.0).
Madrid boundary: geoBoundaries · Open Data ESRI, IGN Central Registry of Cartography Area (CC BY 4.0).
Berlin boundary: geoBoundaries · Federal Agency for Cartography and Geodesy (dl-de/by-2-0).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
Lizarda 2,999 inhabitants25,539 ha reached on 5 Sept4.4 %
-
5,637 ha reached on 4 Sept0.4 %
-
Recursolândia 3,421 inhabitants204 ha reached on 15 Sept0.1 %
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 2025Built-up area0.38 ha
Residents≈ 30
Inside the perimeter there were about 0.38 hectares of built-up land and about 30 residents (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 Extreme FWI: 46 % of the area in Brazil Strong wind: 3.1 % of the area in Brazil 60 days without rain: 55 % of the area in Brazil
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 2 Sept | 36.0 °C | 24 % | 54 km/h | 0.0 mm | Very extreme 70 |
| 3 Sept | 35.3 °C | 25 % | 53 km/h | 0.0 mm | Extreme 66 |
| 4 Sept | 35.6 °C | 26 % | 55 km/h | 0.0 mm | Extreme 67 |
| 5 Sept | 35.6 °C | 24 % | 52 km/h | 0.0 mm | Extreme 63 |
| 6 Sept | 36.4 °C | 20 % | 43 km/h | 0.0 mm | Extreme 58 |
| 7 Sept | 37.7 °C | 19 % | 45 km/h | 0.0 mm | Extreme 60 |
| 8 Sept | 36.9 °C | 22 % | 45 km/h | 0.0 mm | Extreme 61 |
| 9 Sept | 37.1 °C | 17 % | 48 km/h | 0.0 mm | Extreme 64 |
| 10 Sept | 39.0 °C | 13 % | 39 km/h | 0.0 mm | Extreme 66 |
| 11 Sept | 38.7 °C | 18 % | 28 km/h | 0.0 mm | Extreme 57 |
| 12 Sept | 37.3 °C | 20 % | 45 km/h | 0.0 mm | Extreme 61 |
| 13 Sept | 36.2 °C | 23 % | 31 km/h | 0.0 mm | Very high 50 |
| 14 Sept | 37.7 °C | 20 % | 29 km/h | 0.0 mm | Extreme 52 |
| 15 Sept | 38.2 °C | 17 % | 32 km/h | 0.0 mm | Extreme 54 |
| 16 Sept | 37.3 °C | 23 % | 41 km/h | 0.0 mm | Extreme 51 |
| 17 Sept | 37.7 °C | 22 % | 42 km/h | 0.0 mm | Extreme 56 |
| 18 Sept | 37.5 °C | 23 % | 28 km/h | 0.0 mm | Extreme 52 |
| 19 Sept | 36.3 °C | 27 % | 21 km/h | 0.0 mm | Very high 48 |
| 20 Sept | 35.9 °C | 26 % | 34 km/h | 0.0 mm | Extreme 51 |
| 21 Sept | 32.6 °C | 41 % | 28 km/h | 1.0 mm | High 33 |
| 22 Sept | 34.3 °C | 45 % | 31 km/h | 1.6 mm | High 34 |
| 23 Sept | 33.9 °C | 40 % | 30 km/h | 0.9 mm | Moderate 21 |
| 24 Sept | 38.0 °C | 26 % | 38 km/h | 0.0 mm | Very high 47 |
| 25 Sept after | 36.4 °C | 26 % | 42 km/h | 0.0 mm | Very high 47 |
| 26 Sept after | 35.9 °C | 27 % | 39 km/h | 0.0 mm | Extreme 51 |
| 27 Sept after | 35.6 °C | 25 % | 44 km/h | 0.0 mm | Extreme 51 |
| 28 Sept after | 36.6 °C | 21 % | 49 km/h | 0.0 mm | Extreme 59 |
| 29 Sept after | 37.1 °C | 24 % | 42 km/h | 0.0 mm | Extreme 53 |
| 30 Sept after | 37.7 °C | 21 % | 41 km/h | 0.0 mm | Extreme 57 |
| 1 Oct after | 37.5 °C | 23 % | 37 km/h | 0.0 mm | Very high 49 |
| 2 Oct after | 37.9 °C | 18 % | 34 km/h | 0.0 mm | Very high 49 |
| 3 Oct after | 37.5 °C | 22 % | 37 km/h | 0.0 mm | Extreme 53 |
| 4 Oct after | 36.7 °C | 22 % | 52 km/h | 0.0 mm | Extreme 62 |
Its twins: fires that started in the same weather
It started with an FWI of 70.3, a minimum humidity of 24% and more than two months without rain. Fires in the area that started in weather like this since 2016: 16.
FWI at the start
70.3
Minimum humidity
24 %
Days without rain
60+
this fire
chosen twins
rest of the area
Almost identicalSimilar
Outlines of the closest twins
This fire · Balsas fire, 2 September 2025
31,197 ha
23 days
FWI 70.3
Min. humidity 24 %
Palmas fire, September 2020
3,184 ha
9 days
FWI 70.2
Min. humidity 24 %
175 km away, in 2020
First rain (1 mm or more) after it ended: none in the following ten days.
Rio Sono fire, September 2017
5,840 ha
4 days
FWI 71.6
Min. humidity 23 %
59 km away, in 2017
First rain (1 mm or more) after it ended: none in the following ten days.
Novo Acordo fire, September 2016
5,409 ha
5 days
FWI 69.0
Min. humidity 24 %
138 km away, in 2016
First rain (1 mm or more) after it ended: none in the following ten days.
Lizarda fire, August 2016
3,186 ha
9 days
FWI 69.3
Min. humidity 23 %
61 km away, in 2016
First rain (1 mm or more) after it ended: none in the following ten days.
Lizarda fire, August 2022
11,622 ha
17 days
FWI 67.3
Min. humidity 24 %
100 km away, in 2022
First rain (1 mm or more) after it ended: none in the following ten days.
What happened to them
- 9 days
- median duration
- 5,812 ha
- median area
- 19 %
- went past 10,000 ha
- 6.3 mm
- rain at the end (median; 3 of 16 had it)
It was 5.4 times larger than the median of its twins and lasted 23 days, against 9 days.
None of its 16 twins burned more. The weather on the first day does not explain everything: the wind in the following days, the fuel and the firefighting also count. In 13 of 16, 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 6.3 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
55km/h · max. gust
It was considered over on 24 Sept, and not even 1 mm fell in the following ten days: it went out without rain. Twins with rain when they ended: 3 of 16, with a median of 6.3 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.
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
↔
Before · 26 Aug 2025
After · 1 Oct 2025
Sentinel-2 did not pass over on that day. Try another date, or use false colour, which is daily.
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 12 September 2025 the air beside the fire reached 62 µg/m³ of PM2.5. That day averaged 39: 2.6 times the WHO daily guideline (15).
PM2.5 peak62 µg/m³
Days over the guideline8 days
PM1062 µg/m³
Optical depth0.73
WHO 15
2 Sept7 Sept12 Sept17 Sept22 Sept
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 · 803Every 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
Frequently asked questions
- How long did the Balsas fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 2 September 2025 to 24 September 2025 (23 days). The perimeter dates it from 4 September 2025 to 21 September 2025.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 31,197 hectares (312.0 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire entered 3 municipalities: Lizarda (25,539 ha, 4.4 %); Balsas (5,637 ha, 0.4 %); Recursolândia (204 ha, 0.1 %).
- What was the weather like?
- During the fire the temperature reached 39.0 °C, humidity dropped to 13 % and gusts hit 55 km/h. The fire danger index (FWI) reached 70, class Very 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.
- 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: 16. Their median duration was 9 days and their median area 5,812 ha; 19 % went past 10,000 ha. None of its 16 twins burned more. The weather on the first day does not explain everything: the wind in the following days, the fuel and the firefighting also count. In 13 of 16, 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 6.3 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.
- Last day with fire: 21 September 2025 → 24 September 2025.
- Start date: 4 September 2025 → 2 September 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
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 4 September 2025 to 21 September 2025. 803 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.
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.