How long did the Pak Phli fire last?

GWIS (Copernicus) dates it between 25 January 2026 and 28 January 2026: 4 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 2,718 hectares (27.2 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire entered 2 municipalities: Pak Phli (2,409 ha, 5.6 %); Mueang Prachin Buri (324 ha, 0.7 %).

What was the weather like?

During the fire the temperature reached 33.8 °C, humidity dropped to 33 % and gusts hit 35 km/h. The fire danger index (FWI) reached 28, class High.

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.

TH · Thailand · 2026-01-25 → 2026-01-28

Pak Phli fire, 25 January 2026 ปากพลี · Pak Phli, Mueang Prachin Buri

Out · last detection 28 Jan 2026, 06:53 UTC

The fire started on 25 January 2026 in Pak Phli, Thailand, and satellites saw it burning for 4 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 2,718 hectares from heat detections, spread across 2 municipalities.

It is the 2th largest in Nakhon Nayok Province since 2016 (of 10 with a page). Number 221 in Thailand in 2026, of 689.

Compare with…

Suggestions: Mueang Prachin Buri · 2025 Mueang Prachin Buri · 2023 Pak Phli · 2026 Pak Phli · 2026

Burnt area: 2,718ha; GWIS perimeter (Copernicus)
Duration: 4days; 25 Jan 2026 – 28 Jan 2026
Municipalities hit: 2; districts
Started on: 25 Jan; 2026
Heat detections: 73; in a single hotspot: 75 MW
Danger at start: 18; Moderate · FWI index
Average daily power: 239MW; detected power per day, on average

HOTSPOTS BY DAY 25 Jan28 Jan

Play back 28 Jan 2026

How it evolved, day by day

25 Jan 27 Jan 28 Jan

Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.

The weather it burned in

34°high

35km/h · peak gust

33%lowest humidity

It had gone 36 days without rain (1 mm or more) when it started.

This area had burned before

99% of the perimeter overlaps earlier fires recorded since 2016: 931 ha in 2016, 1,128 ha in 2017, 530 ha in 2018, 2,144 ha in 2019, 2,874 ha in 2020, 1,591 ha in 2021, 1,381 ha in 2022, 1,565 ha in 2023, 672 ha in 2024, 1,946 ha in 2025. Part of it burned more than once, so the yearly figures add up to more than the 2,679 ha that had burned before.

How big is it?

It burned the equivalent of 1.7% of the area of London (27 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

Pak Phli ปากพลี where it started

2,409 ha

5.6 %
Mueang Prachin Buri เมืองปราจีนบุรี

324 ha

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.

People and buildings inside the perimeter

GHSL 2025

Built-up area13 ha

Residents≈ 850

Inside the perimeter there were about 13 hectares of built-up land and about 850 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)

Day	High	Min. humidity	Peak gust	Rain	Danger (FWI)
18 Jan	32.7 °C	50 %	20 km/h	0.0 mm	Moderate 18
19 Jan	32.8 °C	51 %	18 km/h	0.2 mm	Moderate 18
20 Jan	32.3 °C	54 %	19 km/h	1.3 mm	Low 9
21 Jan	33.8 °C	36 %	26 km/h	0.0 mm	Moderate 19
22 Jan	32.6 °C	33 %	33 km/h	0.0 mm	High 26
23 Jan	31.4 °C	37 %	35 km/h	0.0 mm	High 26
24 Jan	31.5 °C	35 %	28 km/h	0.0 mm	High 25
25 Jan	32.6 °C	34 %	22 km/h	0.0 mm	High 23
26 Jan	31.9 °C	40 %	21 km/h	0.0 mm	High 22
27 Jan	33.1 °C	33 %	25 km/h	0.0 mm	High 25
28 Jan	32.7 °C	35 %	31 km/h	0.0 mm	High 28
29 Jan after	32.9 °C	37 %	25 km/h	0.0 mm	High 25
30 Jan after	33.1 °C	43 %	16 km/h	0.0 mm	High 22
31 Jan after	34.4 °C	40 %	22 km/h	0.0 mm	High 24
1 Feb after	33.3 °C	38 %	32 km/h	0.0 mm	High 27
2 Feb after	32.3 °C	40 %	38 km/h	0.0 mm	High 31
3 Feb after	32.3 °C	43 %	35 km/h	0.0 mm	High 29
4 Feb after	33.3 °C	40 %	25 km/h	0.0 mm	High 24
5 Feb after	34.4 °C	41 %	19 km/h	0.0 mm	High 24
6 Feb after	33.9 °C	49 %	22 km/h	0.0 mm	High 23
7 Feb after	34.6 °C	48 %	18 km/h	0.0 mm	High 24

Before and after, from space

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

↔

Before · 18 Jan 2026

After · 4 Feb 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 31 January 2026 the air beside the fire reached 53 µg/m³ of PM2.5. That day averaged 39: 2.6 times the WHO daily guideline (15).

PM2.5 peak53 µg/m³

Days over the guideline9 days

PM1054 µg/m³

Optical depth0.76

WHO 15

232425262728293031

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 · 73Every 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 Thailand ›

Frequently asked questions

How long did the Pak Phli fire last?: GWIS (Copernicus) dates it between 25 January 2026 and 28 January 2026: 4 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 2,718 hectares (27.2 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire entered 2 municipalities: Pak Phli (2,409 ha, 5.6 %); Mueang Prachin Buri (324 ha, 0.7 %).
What was the weather like?: During the fire the temperature reached 33.8 °C, humidity dropped to 33 % and gusts hit 35 km/h. The fire danger index (FWI) reached 28, class High.
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

NASA FIRMS ↗
GWIS · Copernicus ↗

History of this page Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.

No changes since 24 October 2026.

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 199 · 191.

How we know this

Perimeter: GWIS (Copernicus), rebuilt from heat detections rather than mapped on imagery.
Dates from the perimeter: the VIIRS detections inside it did not change them. 73 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.

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.

Where it burned