How long did the Mirninsky Ulus fire last?

According to the heat detections seen by satellite inside the perimeter, it burned from 3 August 2026 to 23 August 2026 (21 days). The perimeter dates it from 3 August 2026 to 16 August 2026.

How much area did it burn?

The perimeter GWIS (Copernicus) rebuilt from heat detections is 9,968 hectares (99.7 km²). It is an estimate: official national figures may differ.

Which municipalities burned?

The fire only entered Mirninsky Ulus (10,515 ha, 0.1 %).

What was the weather like?

During the fire the temperature reached 23.7 °C, humidity dropped to 24 % and gusts hit 49 km/h. The fire danger index (FWI) reached 30, class High.

Where does this data come from?

From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Russia (geoBoundaries). It is not an official report.

RU · Russia · 2026-08-03 → 2026-08-23

Mirninsky Ulus fire, 3 August 2026 Mirninsky Ulus

Out · last detection 24 Aug 2026, 20:57 UTC

The fire started on 3 August 2026 in Mirninsky Ulus, Russia, and satellites saw it burning for 21 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 9,968 hectares from heat detections, spread across a single municipality.

It is the 508th largest in Sakha Republic since 2016 (of 1422 with a page). Number 120 in Russia in 2026, of 418.

Compare with…

Suggestions: Mirninsky Ulus · 2026 Mirninsky Ulus · 2020 Mirninsky Ulus · 2026 Mirninsky Ulus · 2026

Burnt area: 9,968ha; GWIS perimeter (Copernicus)
Duration: 21days; 3 Aug 2026 – 23 Aug 2026
Municipalities hit: 1; districts
Started on: 3 Aug; 2026
Heat detections: 1,580; in a single hotspot: 122 MW
Danger at start: 15; Moderate · FWI index
Average daily power: 744MW; detected power per day, on average

HOTSPOTS BY DAY 3 Aug23 Aug

Play back 24 Aug 2026

How it evolved, day by day

4 Aug 6 Aug 7 Aug 10 Aug 13 Aug 19 Aug 22 Aug

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

The weather it burned in

24°high

49km/h · peak gust

24%lowest humidity

It had gone 0 days without rain (1 mm or more) when it started. Rain came after the fire: 2.3 mm on 31 Aug.

This area had burned before

No earlier perimeters overlap this fire since 2016, when the satellite record begins.

How big is it?

It burned the equivalent of 6.3% of the area of London (100 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

Mirninsky Ulus where it started

10,515 ha reached on 4 Aug

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 area< 0.1 ha

Residents< 20

Inside the perimeter there was no noticeable 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

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)
3 Aug	14.7 °C	36 %	41 km/h	0.9 mm	Moderate 15
4 Aug	16.2 °C	33 %	30 km/h	0.0 mm	Moderate 16
5 Aug	21.0 °C	27 %	26 km/h	0.0 mm	Moderate 20
6 Aug	23.7 °C	24 %	44 km/h	0.0 mm	High 30
7 Aug	20.6 °C	43 %	49 km/h	1.1 mm	Moderate 14
8 Aug	22.6 °C	49 %	29 km/h	0.0 mm	Moderate 15
9 Aug	18.3 °C	40 %	43 km/h	0.2 mm	Moderate 19
10 Aug	17.5 °C	39 %	23 km/h	0.0 mm	Moderate 18
11 Aug	16.5 °C	38 %	32 km/h	0.0 mm	Moderate 19
12 Aug	17.2 °C	41 %	12 km/h	0.3 mm	Moderate 16
13 Aug	16.5 °C	41 %	24 km/h	1.1 mm	Low 10
14 Aug	14.8 °C	51 %	25 km/h	0.3 mm	Moderate 12
15 Aug	13.2 °C	51 %	38 km/h	0.0 mm	Moderate 15
16 Aug	19.0 °C	43 %	32 km/h	0.2 mm	Moderate 17
17 Aug	18.5 °C	62 %	37 km/h	1.4 mm	Low 7
18 Aug	14.6 °C	55 %	26 km/h	0.2 mm	Low 9
19 Aug	16.6 °C	35 %	22 km/h	0.0 mm	Moderate 14
20 Aug	18.5 °C	31 %	15 km/h	0.0 mm	Moderate 17
21 Aug	19.6 °C	31 %	20 km/h	0.0 mm	Moderate 21
22 Aug	19.2 °C	34 %	17 km/h	0.0 mm	Moderate 21
23 Aug	19.0 °C	32 %	16 km/h	0.0 mm	Moderate 19
24 Aug after	20.9 °C	33 %	20 km/h	0.0 mm	Moderate 21
25 Aug after	20.7 °C	34 %	22 km/h	0.0 mm	Moderate 21
26 Aug after	20.8 °C	29 %	30 km/h	0.0 mm	High 25
27 Aug after	20.3 °C	32 %	30 km/h	0.0 mm	High 24
28 Aug after	18.7 °C	30 %	18 km/h	0.0 mm	High 22
29 Aug after	20.4 °C	37 %	29 km/h	0.3 mm	High 25
30 Aug after	19.3 °C	44 %	28 km/h	0.1 mm	High 22
31 Aug after	21.1 °C	43 %	34 km/h	2.3 mm	Low 8

Before and after, from space

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

↔

Before · 27 Jul 2026

After · 30 Aug 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 12 August 2026 the air beside the fire reached 1,252 µg/m³ of PM2.5. That day averaged 522: 35 times the WHO daily guideline (15).

PM2.5 peak1,252 µg/m³

Days over the guideline17 days

PM101,263 µg/m³

Optical depth5.80

WHO 15

12345678910111213141516171819

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 · 1,580Every 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 Russia ›

Frequently asked questions

How long did the Mirninsky Ulus fire last?: According to the heat detections seen by satellite inside the perimeter, it burned from 3 August 2026 to 23 August 2026 (21 days). The perimeter dates it from 3 August 2026 to 16 August 2026.
How much area did it burn?: The perimeter GWIS (Copernicus) rebuilt from heat detections is 9,968 hectares (99.7 km²). It is an estimate: official national figures may differ.
Which municipalities burned?: The fire only entered Mirninsky Ulus (10,515 ha, 0.1 %).
What was the weather like?: During the fire the temperature reached 23.7 °C, humidity dropped to 24 % and gusts hit 49 km/h. The fire danger index (FWI) reached 30, class High.
Where does this data come from?: From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Russia (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: 112 · Emergency number and official warnings ›

Satellite cross-check

NASA FIRMS ↗
GWIS · Copernicus ↗

History of this page · 1 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.

25 October 2026 Last day with fire: 16 August 2026 → 23 August 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 112.

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 3 August 2026 to 16 August 2026. 1,580 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 (Open Data Commons Open Database License 1.0). 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