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TH · Thailand · –

Na Noi fire, 9 March 2026 นาน้อย · Na Noi, Na Muen, Ban Khok

Out · last detection 25 Apr 2026, 18:56 UTC

The fire started on 9 March 2026 in Na Noi, Thailand, and satellites saw it burning for 48 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 65,403 hectares from heat detections, spread across 6 municipalities.

This page is probably a fire complex, not a single fire. GWIS merges into one perimeter the fires that touch over weeks, which in large burning seasons can join dozens of separate fires. The total area is reliable; the origin and dates refer to the whole complex.

Other fire pages in the same area and on the same dates:

Number 4 in Thailand in 2026, of 688.

GWIS near-real-time perimeter, from the layer that changed in October 2025: this fire is not compared with fires from earlier years, because since then the GWIS layer gives more and larger perimeters.

The power measured by the satellite is low (27.9 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.

Compare with…

Suggestions: Na Noi · 2019Na Noi · 2025Na Noi · 2019Na Noi · 2025

Burnt area
65,403ha
GWIS perimeter (Copernicus)
Duration
48days
9 Mar 2026 – 25 Apr 2026
Municipalities hit
6
districts
Started on
9 Mar
2026
Heat detections
2,039
in a single hotspot: 28 MW
Danger at start
24
High · FWI index
Average daily power
153MW
detected power per day, on average

Where it burned

HOTSPOTS BY DAY 9 Mar25 Apr
25 Apr 2026

How it evolved, day by day

9 Mar 2026 · 9 MW · 7 10 Mar 2026 · 2 MW · 2 12 Mar 2026 · 1 MW · 1 13 Mar 2026 · 1 MW · 1 14 Mar 2026 · 9 MW · 5 17 Mar 2026 · 17 MW · 7 18 Mar 2026 · 64 MW · 37 19 Mar 2026 · 43 MW · 16 20 Mar 2026 · 32 MW · 12 21 Mar 2026 · 3 MW · 2 22 Mar 2026 · 36 MW · 10 23 Mar 2026 · 140 MW · 47 24 Mar 2026 · 307 MW · 83 25 Mar 2026 · 113 MW · 37 26 Mar 2026 · 78 MW · 17 27 Mar 2026 · 47 MW · 21 28 Mar 2026 · 276 MW · 86 29 Mar 2026 · 419 MW · 179 30 Mar 2026 · 234 MW · 70 31 Mar 2026 · 37 MW · 24 1 Apr 2026 · 145 MW · 39 2 Apr 2026 · 268 MW · 64 3 Apr 2026 · 608 MW · 204 4 Apr 2026 · 204 MW · 52 5 Apr 2026 · 29 MW · 13 6 Apr 2026 · 89 MW · 27 7 Apr 2026 · 116 MW · 23 8 Apr 2026 · 455 MW · 115 9 Apr 2026 · 725 MW · 209 10 Apr 2026 · 408 MW · 114 11 Apr 2026 · 138 MW · 29 12 Apr 2026 · 111 MW · 35 13 Apr 2026 · 312 MW · 90 14 Apr 2026 · 270 MW · 98 15 Apr 2026 · 330 MW · 96 16 Apr 2026 · 205 MW · 66 17 Apr 2026 · 34 MW · 11 18 Apr 2026 · 59 MW · 18 19 Apr 2026 · 126 MW · 47 20 Apr 2026 · 43 MW · 17 21 Apr 2026 · 7 MW · 2 24 Apr 2026 · 10 MW · 4 25 Apr 2026 · 1 MW · 2
9 Mar 21 Mar 30 Mar 9 Apr 17 Apr

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

Fire front film How it spread from one satellite pass to the next (88 passes) and with what wind. Watch the film

The weather it burned in

39°high
44km/h · peak gust
18%lowest humidity

It had gone 10 days without rain (1 mm or more) when it started. Rain came after the fire: 2.1 mm on 26 Apr.

This area had burned before

74% of the perimeter overlaps earlier fires recorded since 2016: 10,854 ha in 2016, 12,493 ha in 2017, 4,068 ha in 2018, 15,003 ha in 2019, 8,493 ha in 2020, 8,295 ha in 2021, 108 ha in 2022, 12,401 ha in 2023, 14,564 ha in 2024, 16,616 ha in 2025. Part of it burned more than once, so the yearly figures add up to more than the 48,093 ha that had burned before.

How big is it?

10 km
It burned the equivalent of 41% of the area of London (654 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

  1. Na Noi นาน้อย where it started
    32,663 ha reached on 9 Mar
    27 %
  2. Na Muen นาหมื่น
    14,695 ha reached on 23 Mar
    17 %
  3. Ban Khok บ้านโคก
    13,857 ha reached on 14 Mar
    14 %
  4. Fak Tha ฟากท่า
    5,425 ha reached on 17 Mar
    8.4 %
  5. Wiang Sa เวียงสา
    291 ha reached on 29 Mar
    0.1 %
  6. Tha Pla ท่าปลา
    204 ha reached on 25 Mar
    0.1 %

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 2025
Built-up area3.1 ha
Residents≈ 200

Inside the perimeter there were about 3.1 hectares of built-up land and about 200 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)
9 Mar 33.8 °C 38 % 41 km/h 0.0 mm High 24
10 Mar 31.3 °C 43 % 42 km/h 0.0 mm High 27
11 Mar 31.2 °C 43 % 27 km/h 0.2 mm Moderate 19
12 Mar 31.3 °C 41 % 36 km/h 1.7 mm Moderate 16
13 Mar 28.2 °C 47 % 39 km/h 0.0 mm Moderate 18
14 Mar 30.2 °C 43 % 41 km/h 0.0 mm High 22
15 Mar 31.7 °C 39 % 36 km/h 0.0 mm High 23
16 Mar 31.2 °C 42 % 32 km/h 0.0 mm High 22
17 Mar 31.8 °C 44 % 27 km/h 0.5 mm High 23
18 Mar 34.2 °C 33 % 24 km/h 0.0 mm High 24
19 Mar 35.1 °C 31 % 26 km/h 0.0 mm High 27
20 Mar 35.6 °C 31 % 27 km/h 0.0 mm High 30
21 Mar 34.8 °C 37 % 28 km/h 0.0 mm High 28
22 Mar 34.6 °C 39 % 34 km/h 0.5 mm High 30
23 Mar 36.1 °C 26 % 36 km/h 0.0 mm High 37
24 Mar 36.8 °C 25 % 34 km/h 0.0 mm High 37
25 Mar 37.2 °C 29 % 33 km/h 0.0 mm High 37
26 Mar 37.6 °C 27 % 35 km/h 0.0 mm Very high 38
27 Mar 37.2 °C 29 % 40 km/h 0.1 mm Very high 41
28 Mar 36.8 °C 31 % 35 km/h 0.2 mm High 38
29 Mar 36.3 °C 30 % 41 km/h 0.1 mm Very high 42
30 Mar 36.7 °C 28 % 39 km/h 0.0 mm Very high 41
31 Mar 36.4 °C 32 % 36 km/h 0.0 mm Very high 40
1 Apr 37.2 °C 31 % 31 km/h 0.0 mm High 37
2 Apr 37.7 °C 29 % 34 km/h 0.0 mm Very high 40
3 Apr 37.1 °C 31 % 37 km/h 0.0 mm Very high 43
4 Apr 36.0 °C 36 % 36 km/h 0.0 mm Very high 40
5 Apr 36.8 °C 34 % 37 km/h 0.0 mm Very high 42
6 Apr 37.7 °C 30 % 35 km/h 0.0 mm Very high 40
7 Apr 37.6 °C 31 % 36 km/h 0.0 mm Very high 41
8 Apr 38.1 °C 26 % 40 km/h 0.0 mm Very high 44
9 Apr 37.8 °C 23 % 44 km/h 0.0 mm Extreme 51
10 Apr 38.1 °C 21 % 42 km/h 0.0 mm Very high 50
11 Apr 37.4 °C 28 % 43 km/h 0.0 mm Extreme 53
12 Apr 37.8 °C 24 % 33 km/h 0.0 mm Very high 44
13 Apr 38.2 °C 25 % 36 km/h 0.0 mm Very high 48
14 Apr 38.6 °C 26 % 33 km/h 0.0 mm Very high 46
15 Apr 39.1 °C 21 % 41 km/h 0.0 mm Very high 49
16 Apr 39.4 °C 18 % 36 km/h 0.0 mm Extreme 51
17 Apr 38.7 °C 23 % 31 km/h 0.0 mm Very high 49
18 Apr 37.3 °C 33 % 27 km/h 0.0 mm Very high 40
19 Apr 36.4 °C 37 % 37 km/h 0.2 mm Very high 40
20 Apr 37.1 °C 32 % 37 km/h 0.0 mm Very high 39
21 Apr 37.8 °C 28 % 35 km/h 0.1 mm Very high 40
22 Apr 38.1 °C 35 % 34 km/h 0.0 mm Very high 40
23 Apr 36.3 °C 42 % 36 km/h 0.5 mm Very high 39
24 Apr 34.9 °C 48 % 32 km/h 4.5 mm Low 11
25 Apr 30.3 °C 62 % 31 km/h 1.2 mm Low 6
26 Apr after 33.2 °C 48 % 33 km/h 2.1 mm Low 10

Before and after, from space

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

Before · 2 Mar 2026
After · 2 May 2026

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 17 April 2026 the air beside the fire reached 119 µg/m³ of PM2.5. That day averaged 90: 6.0 times the WHO daily guideline (15).

PM2.5 peak119 µg/m³
Days over the guideline46 days
PM10142 µg/m³
Optical depth1.83
10 Mar20 Mar30 Mar9 Apr19 Apr
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 · 2,039Every 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 timeSatelliteFRP (MW)LatLon

Other fires nearby

All fires in Thailand

Frequently asked questions

How long did the Na Noi fire last?
According to the heat detections seen by satellite inside the perimeter, it burned from 9 March 2026 to 25 April 2026 (48 days). The perimeter dates it from 12 March 2026 to 22 April 2026.
How much area did it burn?
The perimeter GWIS (Copernicus) rebuilt from heat detections is 65,403 hectares (654.0 km²). It is an estimate: official national figures may differ.
Which municipalities burned?
The fire entered 6 municipalities: Na Noi (32,663 ha, 27 %); Na Muen (14,695 ha, 17 %); Ban Khok (13,857 ha, 14 %); Fak Tha (5,425 ha, 8.4 %); Wiang Sa (291 ha, 0.1 %); Tha Pla (204 ha, 0.1 %).
What was the weather like?
During the fire the temperature reached 39.4 °C, humidity dropped to 18 % and gusts hit 44 km/h. The fire danger index (FWI) reached 53, class Extreme.
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 · 3 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
  1. Area: 66,772 → 65,403 ha.
  2. Start date: 12 March 2026 → 9 March 2026.
  3. Last day with fire: 22 April 2026 → 25 April 2026.

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
What do you think is wrong?

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; 13 polygons grouped in this page.
  • Dates adjusted with the VIIRS detections inside the perimeter, which said 12 March 2026 to 22 April 2026. 2,039 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.