Pak Tho fire, 1 April 2026 Pak Tho
The fire started on 1 April 2026 in Pak Tho, Thailand, and satellites saw it burning for 5 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 1,084 hectares from heat detections, spread across a single municipality.
It is the 58th largest in Ratchaburi Province since 2016 (of 63 with a page). Number 797 in Thailand in 2026, of 880.
The power measured by the satellite is low (9.4 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
- Burnt area
- 1,084ha
- GWIS perimeter (Copernicus)
- Duration
- 5days
- 1 Apr 2026 – 5 Apr 2026
- Municipalities hit
- 1
- districts
- Started on
- 1 Apr
- 2026
- Heat detections
- 19
- in a single hotspot: 9 MW
- Danger at start
- 11
- Moderate · FWI index
- Energy released
- 58MW
- 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 8 days without rain (1 mm or more) when it started.
This area had burned before
65% of the perimeter overlaps earlier fires recorded since 2016: 292 ha in 2016, 217 ha in 2020, 442 ha in 2024. Part of it burned more than once, so the yearly figures add up to more than the 700 ha that had burned before.
What happened to each town
-
Pak Tho where it started1,090 ha reached on 2 Apr1.3 %
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) |
|---|---|---|---|---|---|
| 1 Apr | 34.4 °C | 52 % | 17 km/h | 0.1 mm | Moderate 11 |
| 2 Apr | 34.6 °C | 51 % | 24 km/h | 0.0 mm | Moderate 14 |
| 3 Apr | 35.4 °C | 52 % | 17 km/h | 0.1 mm | Moderate 13 |
| 4 Apr | 35.2 °C | 48 % | 23 km/h | 0.7 mm | Moderate 12 |
| 5 Apr | 35.1 °C | 47 % | 25 km/h | 0.1 mm | Moderate 15 |
| 6 Apr after | 35.3 °C | 47 % | 27 km/h | 0.0 mm | Moderate 15 |
| 7 Apr after | 35.3 °C | 47 % | 26 km/h | 0.1 mm | Moderate 16 |
| 8 Apr after | 35.2 °C | 49 % | 17 km/h | 0.0 mm | Moderate 15 |
| 9 Apr after | 35.3 °C | 48 % | 20 km/h | 0.0 mm | Moderate 16 |
| 10 Apr after | 35.4 °C | 47 % | 17 km/h | 0.0 mm | Moderate 16 |
| 11 Apr after | 35.4 °C | 44 % | 24 km/h | 0.0 mm | Moderate 18 |
| 12 Apr after | 36.1 °C | 45 % | 20 km/h | 0.0 mm | Moderate 18 |
| 13 Apr after | 35.6 °C | 42 % | 18 km/h | 0.0 mm | Moderate 19 |
| 14 Apr after | 36.6 °C | 39 % | 22 km/h | 0.0 mm | Moderate 21 |
| 15 Apr after | 35.7 °C | 48 % | 18 km/h | 0.0 mm | Moderate 21 |
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 1 April 2026 the air beside the fire reached 40 µg/m³ of PM2.5. That day averaged 30: 2.0 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 · 19Every 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 Pak Tho fire last?
- GWIS (Copernicus) dates it between 1 April 2026 and 5 April 2026: 5 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 1,084 hectares (10.8 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Pak Tho (1,090 ha, 1.3 %).
- What was the weather like?
- During the fire the temperature reached 35.4 °C, humidity dropped to 47 % and gusts hit 25 km/h. The fire danger index (FWI) reached 15, class Moderate.
- 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
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.