Mae Charim fire, 25 March 2026 แม่จริม · Mae Charim
The fire started on 25 March 2026 in Mae Charim, Thailand, and satellites saw it burning for 26 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 4,703 hectares from heat detections, spread across a single municipality.
It is the 13th largest in Nan Province since 2016 (of 189 with a page). Number 126 in Thailand in 2026, of 689.
Compare with…
- Burnt area
- 4,703ha
- GWIS perimeter (Copernicus)
- Duration
- 26days
- 25 Mar 2026 – 19 Apr 2026
- Municipalities hit
- 1
- districts
- Started on
- 25 Mar
- 2026
- Heat detections
- 137
- in a single hotspot: 49 MW
- Average daily power
- 28MW
- detected power per day, on average
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.
This area had burned before
89% of the perimeter overlaps earlier fires recorded since 2016: 470 ha in 2016, 848 ha in 2017, 1,632 ha in 2019, 2,532 ha in 2020, 2,615 ha in 2023, 1,655 ha in 2024. Part of it burned more than once, so the yearly figures add up to more than the 4,185 ha that had burned before.
- 1,310 ha Mae Charim fire, March 2020 1,803 ha in total; the hectares shown are those it shares with this fire
- 1,071 ha Mae Charim fire, March 2023 1,652 ha in total; the hectares shown are those it shares with this fire
- 327 ha Mae Charim fire, March 2020 1,865 ha in total; the hectares shown are those it shares with this fire
- 157 ha Mae Charim fire, March 2016 1,188 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).
Bangkok boundary: geoBoundaries · OpenStreetMap, Wambacher · © OpenStreetMap contributors (ODbL 1.0).
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).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
4,727 ha reached on 27 Mar4.5 %
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 2025Inside the perimeter there were about 0.11 hectares of 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
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 18 April 2026 the air beside the fire reached 159 µg/m³ of PM2.5. That day averaged 104: 6.9 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 · 137Every satellite heat detection, one by one, with time, satellite, power and coordinates.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
Frequently asked questions
- How long did the Mae Charim fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 25 March 2026 to 19 April 2026 (26 days). The perimeter dates it from 27 March 2026 to 17 April 2026.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 4,703 hectares (47.0 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Mae Charim (4,727 ha, 4.5 %).
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Thailand (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: 199 · 191 · 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: 17 April 2026 → 19 April 2026.
- Start date: 27 March 2026 → 25 March 2026.
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; 2 polygons grouped in this page.
- Dates adjusted with the VIIRS detections inside the perimeter, which said 27 March 2026 to 17 April 2026. 137 Suomi-NPP VIIRS detections on those dates.
- We have not matched this page with any official record.
- 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.